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values | context stringlengths 151 1.22k | question stringlengths 12 184 | answers dict | masked_query stringlengths 12 184 | query_embedding listlengths 768 768 |
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5a4d7b69755ab9001a10f3ff | Web_browser | Early web browsers supported only a very simple version of HTML. The rapid development of proprietary web browsers led to the development of non-standard dialects of HTML, leading to problems with interoperability. Modern web browsers support a combination of standards-based and de facto HTML and XHTML, which should be... | What are two things that a simple HTML version supports? | {
"text": [],
"answer_start": []
} | What are [MASK] things that a simple HTML version supports? | [
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5a4d7eb1755ab9001a10f40f | Web_browser | Web browsers consist of a user interface, layout engine, rendering engine, JavaScript interpreter, UI backend, networking component and data persistence component. These components achieve different functionalities of a web browser and together provide all capabilities of a web browser. | What are two things that make up a UI backend? | {
"text": [],
"answer_start": []
} | What are [MASK] things that make up a UI backend? | [
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5a4d7eb1755ab9001a10f410 | Web_browser | Web browsers consist of a user interface, layout engine, rendering engine, JavaScript interpreter, UI backend, networking component and data persistence component. These components achieve different functionalities of a web browser and together provide all capabilities of a web browser. | What does a JavaScript interpreter achieve in a layout engine? | {
"text": [],
"answer_start": []
} | What does a JavaScript interpreter achieve in a layout engine? | [
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5a4d7eb1755ab9001a10f411 | Web_browser | Web browsers consist of a user interface, layout engine, rendering engine, JavaScript interpreter, UI backend, networking component and data persistence component. These components achieve different functionalities of a web browser and together provide all capabilities of a web browser. | What do a rendering engine and a user interface create when only used with each other? | {
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} | What do a rendering engine and a user interface create when only used with each other? | [
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5a4d7eb1755ab9001a10f412 | Web_browser | Web browsers consist of a user interface, layout engine, rendering engine, JavaScript interpreter, UI backend, networking component and data persistence component. These components achieve different functionalities of a web browser and together provide all capabilities of a web browser. | What parts of a layout engine make up a data persistence component? | {
"text": [],
"answer_start": []
} | What parts of a layout engine make up a data persistence component? | [
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5a4d7eb1755ab9001a10f413 | Web_browser | Web browsers consist of a user interface, layout engine, rendering engine, JavaScript interpreter, UI backend, networking component and data persistence component. These components achieve different functionalities of a web browser and together provide all capabilities of a web browser. | What does a user interface achieve when part of a UI backend? | {
"text": [],
"answer_start": []
} | What does a user interface achieve when part of a UI backend? | [
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5acd2f4507355d001abf3836 | BeiDou_Navigation_Satellite_System | The BeiDou Navigation Satellite System (BDS, simplified Chinese: 北斗卫星导航系统; traditional Chinese: 北斗衛星導航系統; pinyin: Běidǒu wèixīng dǎoháng xìtǒng) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale glo... | What is the Limited Navigation Satellite System? | {
"text": [],
"answer_start": []
} | What is [MASK]? | [
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5acd2f4507355d001abf3837 | BeiDou_Navigation_Satellite_System | The BeiDou Navigation Satellite System (BDS, simplified Chinese: 北斗卫星导航系统; traditional Chinese: 北斗衛星導航系統; pinyin: Běidǒu wèixīng dǎoháng xìtǒng) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale glo... | The BeiDou Navigation Satellite System consists of 3 separate what? | {
"text": [],
"answer_start": []
} | [MASK] consists of [MASK] separate what? | [
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5acd2f4507355d001abf3838 | BeiDou_Navigation_Satellite_System | The BeiDou Navigation Satellite System (BDS, simplified Chinese: 北斗卫星导航系统; traditional Chinese: 北斗衛星導航系統; pinyin: Běidǒu wèixīng dǎoháng xìtǒng) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale glo... | What type of system has been operating since 2010? | {
"text": [],
"answer_start": []
} | What type of system has been operating since [MASK]? | [
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5acd2f4507355d001abf3839 | BeiDou_Navigation_Satellite_System | The BeiDou Navigation Satellite System (BDS, simplified Chinese: 北斗卫星导航系统; traditional Chinese: 北斗衛星導航系統; pinyin: Běidǒu wèixīng dǎoháng xìtǒng) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale glo... | Which system is no longer under construction? | {
"text": [],
"answer_start": []
} | Which system is no longer under construction? | [
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5acd303507355d001abf3870 | BeiDou_Navigation_Satellite_System | The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: 北斗卫星导航试验系统; traditional Chinese: 北斗衛星導航試驗系統; pinyin: Běidǒu wèixīng dǎoháng shìyàn xìtǒng) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has bee... | Which system has been offering services to customers in China since 1997? | {
"text": [],
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} | Which system has been offering services to customers in [MASK] since [MASK]? | [
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5acd303507355d001abf3871 | BeiDou_Navigation_Satellite_System | The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: 北斗卫星导航试验系统; traditional Chinese: 北斗衛星導航試驗系統; pinyin: Běidǒu wèixīng dǎoháng shìyàn xìtǒng) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has bee... | What system is also known as BeiDou-2? | {
"text": [],
"answer_start": []
} | What system is also known as [MASK]? | [
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5acd303507355d001abf3872 | BeiDou_Navigation_Satellite_System | The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: 北斗卫星导航试验系统; traditional Chinese: 北斗衛星導航試驗系統; pinyin: Běidǒu wèixīng dǎoháng shìyàn xìtǒng) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has bee... | BeiDou-1 consists of 7 satellites and offers what? | {
"text": [],
"answer_start": []
} | [MASK] consists of [MASK] satellites and offers what? | [
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5acd303507355d001abf3873 | BeiDou_Navigation_Satellite_System | The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: 北斗卫星导航试验系统; traditional Chinese: 北斗衛星導航試驗系統; pinyin: Běidǒu wèixīng dǎoháng shìyàn xìtǒng) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has bee... | What system offers services to customers in and around Peru? | {
"text": [],
"answer_start": []
} | What system offers services to customers in and around [MASK]? | [
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5acd30f207355d001abf389a | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | Which system is under construction until May 2017? | {
"text": [],
"answer_start": []
} | Which system is under construction until [MASK]? | [
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5acd30f207355d001abf389b | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | Which system is also known as COMPANION or BeiDou-23? | {
"text": [],
"answer_start": []
} | Which system is also known as [MASK] or [MASK]? | [
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5acd30f207355d001abf389c | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | Which system has been operating in China since December 2012? | {
"text": [],
"answer_start": []
} | Which system has been operating in [MASK] since [MASK]? | [
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5acd30f207355d001abf389d | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | BeiDou-1 has how many satellites in use? | {
"text": [],
"answer_start": []
} | [MASK] has how many satellites in use? | [
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5acd30f207355d001abf389e | BeiDou_Navigation_Satellite_System | The second generation of the system, officially called the BeiDou Navigation Satellite System (BDS) and also known as COMPASS or BeiDou-2, will be a global satellite navigation system consisting of 35 satellites, and is under construction as of January 2015[update]. It became operational in China in December 2011, with... | BeiDou-2 began offering services to customers in South America in what year? | {
"text": [],
"answer_start": []
} | [MASK] began offering services to customers in [MASK] in what [MASK]? | [
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5acd32be07355d001abf38f0 | BeiDou_Navigation_Satellite_System | In-mid 2015, China started the build-up of the third generation BeiDou system (BDS-3) in the global coverage constellation. The first BDS-3 satellite was launched 30 September 2015. As of March 2016, 4 BDS-3 in-orbit validation satellites have been launched. | Which system did China start building in March of 2017? | {
"text": [],
"answer_start": []
} | Which system did [MASK] start building in [MASK]? | [
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5acd32be07355d001abf38f1 | BeiDou_Navigation_Satellite_System | In-mid 2015, China started the build-up of the third generation BeiDou system (BDS-3) in the global coverage constellation. The first BDS-3 satellite was launched 30 September 2015. As of March 2016, 4 BDS-3 in-orbit validation satellites have been launched. | Which satellite was first launched on September 27th, 2015? | {
"text": [],
"answer_start": []
} | Which satellite was first launched on [MASK]? | [
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5acd32be07355d001abf38f2 | BeiDou_Navigation_Satellite_System | In-mid 2015, China started the build-up of the third generation BeiDou system (BDS-3) in the global coverage constellation. The first BDS-3 satellite was launched 30 September 2015. As of March 2016, 4 BDS-3 in-orbit validation satellites have been launched. | As of which month during 2016 were there 17 BDS-3 satellites in orbit? | {
"text": [],
"answer_start": []
} | As of which month during [MASK] were there [MASK] BDS-3 satellites in orbit? | [
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5acd32be07355d001abf38f3 | BeiDou_Navigation_Satellite_System | In-mid 2015, China started the build-up of the third generation BeiDou system (BDS-3) in the global coverage constellation. The first BDS-3 satellite was launched 30 September 2015. As of March 2016, 4 BDS-3 in-orbit validation satellites have been launched. | When did Africa begin constructing the third BeiDou system? | {
"text": [],
"answer_start": []
} | When did [MASK] begin constructing the [MASK] [MASK] system? | [
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5acd32be07355d001abf38f4 | BeiDou_Navigation_Satellite_System | In-mid 2015, China started the build-up of the third generation BeiDou system (BDS-3) in the global coverage constellation. The first BDS-3 satellite was launched 30 September 2015. As of March 2016, 4 BDS-3 in-orbit validation satellites have been launched. | How many BDS-20 satellites have been launched? | {
"text": [],
"answer_start": []
} | How many BDS-20 satellites have been launched? | [
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5acd331d07355d001abf3920 | BeiDou_Navigation_Satellite_System | According to China daily. Fifteen years after the satellite system was launched, it is now generating $31.5 billion for major companies such as China Aerospace Science and Industry Corp, AutoNavi Holdings Ltd, and China North Industries Group Corp. | How long ago was the BlueDynamite Satellite System first launched? | {
"text": [],
"answer_start": []
} | How long ago was [MASK] [MASK] launched? | [
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5acd331d07355d001abf3921 | BeiDou_Navigation_Satellite_System | According to China daily. Fifteen years after the satellite system was launched, it is now generating $31.5 billion for major companies such as China Aerospace Science and Industry Corp, AutoNavi Holdings Ltd, and China North Industries Group Corp. | How much revenue for companies is generated by the ABC system? | {
"text": [],
"answer_start": []
} | How much revenue for companies is generated by the [MASK] system? | [
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5acd331d07355d001abf3922 | BeiDou_Navigation_Satellite_System | According to China daily. Fifteen years after the satellite system was launched, it is now generating $31.5 billion for major companies such as China Aerospace Science and Industry Corp, AutoNavi Holdings Ltd, and China North Industries Group Corp. | What are some companies that experience losses from the BDS system? | {
"text": [],
"answer_start": []
} | What are some companies that experience losses from the BDS system? | [
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5acd331d07355d001abf3923 | BeiDou_Navigation_Satellite_System | According to China daily. Fifteen years after the satellite system was launched, it is now generating $31.5 billion for major companies such as China Aerospace Science and Industry Corp, AutoNavi Holdings Ltd, and China North Industries Group Corp. | 17 years after it's launch, how much does the satellite system generate in profit? | {
"text": [],
"answer_start": []
} | [MASK] after it 's launch, how much does the satellite system generate in profit? | [
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5acd33c007355d001abf3932 | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | Which Satellite System is named after the Little Dipper? | {
"text": [],
"answer_start": []
} | Which Satellite System is named after the Little Dipper? | [
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5acd33c007355d001abf3933 | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | What is the Big Dipper constellation known as in Japanese? | {
"text": [],
"answer_start": []
} | What is the Big Dipper constellation known as in [MASK]? | [
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5acd33c007355d001abf3934 | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | What does Yuèliàng translate as? | {
"text": [],
"answer_start": []
} | What does [MASK] translate as? | [
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5acd33c007355d001abf3935 | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | What was the Little Dipper constellation used for? | {
"text": [],
"answer_start": []
} | What was the Little Dipper constellation used for? | [
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5acd33c007355d001abf3936 | BeiDou_Navigation_Satellite_System | The official English name of the system is BeiDou Navigation Satellite System. It is named after the Big Dipper constellation, which is known in Chinese as Běidǒu. The name literally means "Northern Dipper", the name given by ancient Chinese astronomers to the seven brightest stars of the Ursa Major constellation. Hist... | Ancient anthropologists named the constellation what? | {
"text": [],
"answer_start": []
} | Ancient anthropologists named the constellation what? | [
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5acd345807355d001abf3946 | BeiDou_Navigation_Satellite_System | The original idea of a Chinese satellite navigation system was conceived by Chen Fangyun and his colleagues in the 1980s. According to the China National Space Administration, the development of the system would be carried out in three steps: | Who first came up with the idea for a Japanese satellite navigation system? | {
"text": [],
"answer_start": []
} | Who first came up with the idea for a [MASK] satellite navigation system? | [
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5acd345807355d001abf3947 | BeiDou_Navigation_Satellite_System | The original idea of a Chinese satellite navigation system was conceived by Chen Fangyun and his colleagues in the 1980s. According to the China National Space Administration, the development of the system would be carried out in three steps: | When did Chen Fangyun come up with the idea for an ocean navigation system? | {
"text": [],
"answer_start": []
} | When did [MASK] come up with the idea for an ocean navigation system? | [
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5acd345807355d001abf3948 | BeiDou_Navigation_Satellite_System | The original idea of a Chinese satellite navigation system was conceived by Chen Fangyun and his colleagues in the 1980s. According to the China National Space Administration, the development of the system would be carried out in three steps: | The American National Space Administration said the satellite navigation system would be developed in how many steps? | {
"text": [],
"answer_start": []
} | [MASK] said the satellite navigation system would be developed in how many steps? | [
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5acd345807355d001abf3949 | BeiDou_Navigation_Satellite_System | The original idea of a Chinese satellite navigation system was conceived by Chen Fangyun and his colleagues in the 1980s. According to the China National Space Administration, the development of the system would be carried out in three steps: | What idea did Chen Fangyun come up with in 1924? | {
"text": [],
"answer_start": []
} | What idea did [MASK] come up with in [MASK]? | [
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5acd345807355d001abf394a | BeiDou_Navigation_Satellite_System | The original idea of a Chinese satellite navigation system was conceived by Chen Fangyun and his colleagues in the 1980s. According to the China National Space Administration, the development of the system would be carried out in three steps: | Who said the system would be developed in four total steps? | {
"text": [],
"answer_start": []
} | Who said the system would be developed in [MASK] total steps? | [
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5acd353307355d001abf3950 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. | What was the name of the eighth satellite launched for the system? | {
"text": [],
"answer_start": []
} | What was the name of the [MASK] satellite launched for the system? | [
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5acd353307355d001abf3952 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. | What was the name of the third submarine launched for the system? | {
"text": [],
"answer_start": []
} | What was the name of the [MASK] submarine launched for the system? | [
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5acd353307355d001abf3953 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. | When was the BeiDou-1C rocket launched? | {
"text": [],
"answer_start": []
} | When was the [MASK] rocket launched? | [
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5acd353307355d001abf3954 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on 30 October 2000, followed by BeiDou-1B on 20 December 2000. The third satellite, BeiDou-1C (a backup satellite), was put into orbit on 25 May 2003. The successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. | The unsuccessful launch of BeiDou-1E happened when? | {
"text": [],
"answer_start": []
} | The unsuccessful launch of BeiDou-1E happened when? | [
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5acd35ea07355d001abf3964 | BeiDou_Navigation_Satellite_System | On 2 November 2006, China announced that from 2008 BeiDou would offer an open service with an accuracy of 10 meters, timing of 0.2 microseconds, and speed of 0.2 meters/second.[citation needed] | China would offer a closed service with an accuracy of what? | {
"text": [],
"answer_start": []
} | [MASK] would offer a closed service with an accuracy of what? | [
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5acd35ea07355d001abf3965 | BeiDou_Navigation_Satellite_System | On 2 November 2006, China announced that from 2008 BeiDou would offer an open service with an accuracy of 10 meters, timing of 0.2 microseconds, and speed of 0.2 meters/second.[citation needed] | Japan announced what on November 2nd, 2006? | {
"text": [],
"answer_start": []
} | [MASK] announced what on [MASK]? | [
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5acd35ea07355d001abf3966 | BeiDou_Navigation_Satellite_System | On 2 November 2006, China announced that from 2008 BeiDou would offer an open service with an accuracy of 10 meters, timing of 0.2 microseconds, and speed of 0.2 meters/second.[citation needed] | Japan promised a timing speed of what with its open service? | {
"text": [],
"answer_start": []
} | [MASK] promised a timing speed of what with its open service? | [
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5acd35ea07355d001abf3967 | BeiDou_Navigation_Satellite_System | On 2 November 2006, China announced that from 2008 BeiDou would offer an open service with an accuracy of 10 meters, timing of 0.2 microseconds, and speed of 0.2 meters/second.[citation needed] | Japan promised a speed of what with its open service? | {
"text": [],
"answer_start": []
} | [MASK] promised a speed of what with its open service? | [
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5acd36d207355d001abf396e | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | In which month of 2007 was the fifth satellite for the BeiDou-1 system launched? | {
"text": [],
"answer_start": []
} | In which month of [MASK] was the [MASK] satellite for the [MASK] system launched? | [
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5acd36d207355d001abf396f | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | What is the official name of the fifth BeiDou-2 satellite? | {
"text": [],
"answer_start": []
} | What is the official name of the [MASK] BeiDou-2 satellite? | [
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5acd36d207355d001abf3970 | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | Which satellite serves as a front-end satellite? | {
"text": [],
"answer_start": []
} | Which satellite serves as a front-end satellite? | [
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5acd36d207355d001abf3971 | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | Which satellite is sometimes called BeiDou-2C? | {
"text": [],
"answer_start": []
} | Which satellite is sometimes called BeiDou-2C? | [
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5acd36d207355d001abf3972 | BeiDou_Navigation_Satellite_System | In February 2007, the fourth and last satellite of the BeiDou-1 system, BeiDou-1D (sometimes called BeiDou-2A, serving as a backup satellite), was sent up into space. It was reported that the satellite had suffered from a control system malfunction but was then fully restored. | According to reports, the satellite had issues with what system and was never fully restored? | {
"text": [],
"answer_start": []
} | According to reports, the satellite had issues with what system and was never fully restored? | [
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... |
5acd3a1e07355d001abf3990 | BeiDou_Navigation_Satellite_System | In April 2007, the first satellite of BeiDou-2, namely Compass-M1 (to validate frequencies for the BeiDou-2 constellation) was successfully put into its working orbit. The second BeiDou-2 constellation satellite Compass-G2 was launched on 15 April 2009. On 15 January 2010, the official website of the BeiDou Navigation ... | BeiDou-X was put into orbit during which month of 2007? | {
"text": [],
"answer_start": []
} | [MASK] was put into orbit during which month of [MASK]? | [
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5acd3c4d07355d001abf39b8 | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | Which navigational system is regional and consists of five satellites? | {
"text": [],
"answer_start": []
} | Which navigational system is regional and consists of [MASK] satellites? | [
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5acd3c4d07355d001abf39b9 | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | The launch weight of what was over 3,000 pounds? | {
"text": [],
"answer_start": []
} | The launch weight of what was [MASK]? | [
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5acd3c4d07355d001abf39ba | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | BeiDou-1 consists of four working satellites and how many backups? | {
"text": [],
"answer_start": []
} | [MASK] consists of [MASK] working satellites and how many backups? | [
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5acd3c4d07355d001abf39bb | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | BeiDou-1 consists of four backup satellites and how many working satellites? | {
"text": [],
"answer_start": []
} | [MASK] consists of [MASK] backup satellites and how many working satellites? | [
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5acd3c4d07355d001abf39bc | BeiDou_Navigation_Satellite_System | BeiDou-1 is an experimental regional navigation system, which consists of four satellites (three working satellites and one backup satellite). The satellites themselves were based on the Chinese DFH-3 geostationary communications satellite and had a launch weight of 1,000 kilograms (2,200 pounds) each. | Which navigational system is national and consists of four satellites? | {
"text": [],
"answer_start": []
} | Which navigational system is national and consists of [MASK] satellites? | [
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5acd3eef07355d001abf3a24 | BeiDou_Navigation_Satellite_System | Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are vi... | BeiDou-1, along with American GPS, use which type of satellites? | {
"text": [],
"answer_start": []
} | [MASK], along with [MASK] GPS, use which type of satellites? | [
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5acd3eef07355d001abf3a25 | BeiDou_Navigation_Satellite_System | Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are vi... | BeiDou-1, along with Russian GLONASS, use which type of satellites? | {
"text": [],
"answer_start": []
} | [MASK], along with [MASK] [MASK], use which type of satellites? | [
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5acd3eef07355d001abf3a26 | BeiDou_Navigation_Satellite_System | Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are vi... | BeiDou-1, along with European Galileo systems, use which type of satellites? | {
"text": [],
"answer_start": []
} | [MASK], along with [MASK] [MASK] systems, use which type of satellites? | [
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5acd3eef07355d001abf3a27 | BeiDou_Navigation_Satellite_System | Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are vi... | Which is a frequency of the vehicular system? | {
"text": [],
"answer_start": []
} | Which is a frequency of the vehicular system? | [
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5acd3eef07355d001abf3a28 | BeiDou_Navigation_Satellite_System | Unlike the American GPS, Russian GLONASS, and European Galileo systems, which use medium Earth orbit satellites, BeiDou-1 uses satellites in geostationary orbit. This means that the system does not require a large constellation of satellites, but it also limits the coverage to areas on Earth where the satellites are vi... | Although, BeiDou-1 uses medium Earth orbit satellites, American GPS systems use which kind? | {
"text": [],
"answer_start": []
} | Although, [MASK] uses medium [MASK] satellites, [MASK] GPS systems use which kind? | [
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5acd3f4f07355d001abf3a38 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | In what year was the fifth and final satellite launched? | {
"text": [],
"answer_start": []
} | In what year was the [MASK] and final satellite launched? | [
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5acd3f4f07355d001abf3a39 | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | In what month was the fourth and final satellite launched? | {
"text": [],
"answer_start": []
} | In what month was the [MASK] and final satellite launched? | [
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5acd3f4f07355d001abf3a3a | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | In what year was the first satellite, BeiDou-1C, launched? | {
"text": [],
"answer_start": []
} | In what year was the [MASK] satellite, BeiDou-1C, launched? | [
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5acd3f4f07355d001abf3a3b | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | In what month was the first satellite, BeiDou-1X, launched? | {
"text": [],
"answer_start": []
} | In what [MASK] was the [MASK] satellite, BeiDou-1X, launched? | [
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5acd3f4f07355d001abf3a3c | BeiDou_Navigation_Satellite_System | The first satellite, BeiDou-1A, was launched on October 31, 2000. The second satellite, BeiDou-1B, was successfully launched on December 21, 2000. The last operational satellite of the constellation, BeiDou-1C, was launched on May 25, 2003. | The second satellite was named BeiDou-12b and was launched in December of what year? | {
"text": [],
"answer_start": []
} | The [MASK] satellite was named BeiDou-12b and was launched in [MASK]? | [
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5acd414c07355d001abf3a92 | BeiDou_Navigation_Satellite_System | In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated). | According to which news agency was the BeiDou resolution as high as .7 metres? | {
"text": [],
"answer_start": []
} | According to which news agency was the [MASK] resolution [MASK]? | [
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5acd414c07355d001abf3a93 | BeiDou_Navigation_Satellite_System | In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated). | In 2008, the XinHuang News Agency reported the resolution of the BeiDou System as how high? | {
"text": [],
"answer_start": []
} | In [MASK], [MASK] reported the resolution of [MASK] as how high? | [
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5acd414c07355d001abf3a94 | BeiDou_Navigation_Satellite_System | In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated). | There are no terminals, but the calibration accuracy is still what? | {
"text": [],
"answer_start": []
} | There are no terminals, but the calibration accuracy is still what? | [
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5acd414c07355d001abf3a95 | BeiDou_Navigation_Satellite_System | In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated). | According to which news agency was the BeiDou-1X monitor resolution as high as .08 metres? | {
"text": [],
"answer_start": []
} | According to which news agency was the [MASK] monitor resolution [MASK]? | [
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5acd414c07355d001abf3a96 | BeiDou_Navigation_Satellite_System | In 2007, the official Xinhua News Agency reported that the resolution of the BeiDou system was as high as 0.5 metres. With the existing user terminals it appears that the calibrated accuracy is 20m (100m, uncalibrated). | What is the uncalibrated accuracy of the BeiDou second generation system? | {
"text": [],
"answer_start": []
} | What is the uncalibrated accuracy of the [MASK] [MASK] generation system? | [
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5acd427007355d001abf3ad4 | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | In what year was the price of a BeiDou-1 ground terminal $250 USD? | {
"text": [],
"answer_start": []
} | In what year was the price of a [MASK] ground terminal [MASK]? | [
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5acd427007355d001abf3ad5 | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | The price of the port was a result of the cost of what? | {
"text": [],
"answer_start": []
} | The price of the port was a result of the cost of what? | [
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5acd427007355d001abf3ad6 | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | The price of what was a result of imported macro chips? | {
"text": [],
"answer_start": []
} | The price of what was a result of imported macro chips? | [
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5acd427007355d001abf3ad7 | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | The price of what was a result of the price of motherboards? | {
"text": [],
"answer_start": []
} | The price of what was a result of the price of motherboards? | [
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0... |
5acd427007355d001abf3ad8 | BeiDou_Navigation_Satellite_System | In 2008, a BeiDou-1 ground terminal cost around CN¥20,000RMB (US$2,929), almost 10 times the price of a contemporary GPS terminal. The price of the terminals was explained as being due to the cost of imported microchips. At the China High-Tech Fair ELEXCON of November 2009 in Shenzhen, a BeiDou terminal priced at CN¥3,... | Where was there a terminal priced over CNY2,000RMB? | {
"text": [],
"answer_start": []
} | Where was there a terminal priced over CNY2,000RMB? | [
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5acd440307355d001abf3b32 | BeiDou_Navigation_Satellite_System | According to Sun Jiadong, the chief designer of the navigation system, "Many organizations have been using our system for a while, and they like it very much." | Who says that many organizations dislike the system? | {
"text": [],
"answer_start": []
} | Who says that many organizations dislike the system? | [
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5acd440307355d001abf3b33 | BeiDou_Navigation_Satellite_System | According to Sun Jiadong, the chief designer of the navigation system, "Many organizations have been using our system for a while, and they like it very much." | Moon Jiadong says that many organizations have been doing what? | {
"text": [],
"answer_start": []
} | [MASK] says that many organizations have been doing what? | [
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5acd440307355d001abf3b34 | BeiDou_Navigation_Satellite_System | According to Sun Jiadong, the chief designer of the navigation system, "Many organizations have been using our system for a while, and they like it very much." | According to the CEO, how do many organizations feel about the system? | {
"text": [],
"answer_start": []
} | According to the CEO, how do many organizations feel about the system? | [
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5acd440307355d001abf3b35 | BeiDou_Navigation_Satellite_System | According to Sun Jiadong, the chief designer of the navigation system, "Many organizations have been using our system for a while, and they like it very much." | Who is quoted as saying not many organizations have used the system? | {
"text": [],
"answer_start": []
} | Who is quoted as saying not many organizations have used the system? | [
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5acd449507355d001abf3b56 | BeiDou_Navigation_Satellite_System | BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orb... | What was BeiDou-3 formerly known as? | {
"text": [],
"answer_start": []
} | What was [MASK] formerly known as? | [
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5acd449507355d001abf3b57 | BeiDou_Navigation_Satellite_System | BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orb... | MAPS is the former name of which satellite? | {
"text": [],
"answer_start": []
} | [MASK] is the former name of which satellite? | [
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5acd449507355d001abf3b58 | BeiDou_Navigation_Satellite_System | BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orb... | Which system will consist of 40 satellites? | {
"text": [],
"answer_start": []
} | Which system will consist of [MASK] satellites? | [
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5acd449507355d001abf3b59 | BeiDou_Navigation_Satellite_System | BeiDou-2 (formerly known as COMPASS) is not an extension to the older BeiDou-1, but rather supersedes it outright. The new system will be a constellation of 35 satellites, which include 5 geostationary orbit satellites for backward compatibility with BeiDou-1, and 30 non-geostationary satellites (27 in medium Earth orb... | The old system will consist of how many non-geostationary satellites satellites? | {
"text": [],
"answer_start": []
} | The old system will consist of how many non-geostationary satellites satellites? | [
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5acd455207355d001abf3b88 | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | Which signals are based on the ABCD principle? | {
"text": [],
"answer_start": []
} | Which signals are based on the ABCD principle? | [
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5acd455207355d001abf3b89 | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | The ranging signals have a simple structure and are based on which principle? | {
"text": [],
"answer_start": []
} | The ranging signals have a simple structure and are based on which principle? | [
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5acd455207355d001abf3b8a | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | The ranging signals, based on the Galileo principle, have what type of structure? | {
"text": [],
"answer_start": []
} | The ranging signals, based on the [MASK] principle, have what type of structure? | [
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5acd455207355d001abf3b8b | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | Who designed the COMPASS international trade system? | {
"text": [],
"answer_start": []
} | Who designed the [MASK] international trade system? | [
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5acd455207355d001abf3b8c | BeiDou_Navigation_Satellite_System | The ranging signals are based on the CDMA principle and have complex structure typical of Galileo or modernized GPS. Similar to the other GNSS, there will be two levels of positioning service: open and restricted (military). The public service shall be available globally to general users. When all the currently planned... | Which system is the predecessor of the GNSS system? | {
"text": [],
"answer_start": []
} | Which system is the predecessor of the GNSS system? | [
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5acd460607355d001abf3ba4 | BeiDou_Navigation_Satellite_System | There are two levels of service provided — a free service to civilians and licensed service to the Chinese government and military. The free civilian service has a 10-meter location-tracking accuracy, synchronizes clocks with an accuracy of 10 nanoseconds, and measures speeds to within 0.2 m/s. The restricted military ... | Aside from the charged service to civilians, what is the other level of service provided? | {
"text": [],
"answer_start": []
} | Aside from the charged service to civilians, what is the other level of service provided? | [
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5acd460607355d001abf3ba5 | BeiDou_Navigation_Satellite_System | There are two levels of service provided — a free service to civilians and licensed service to the Chinese government and military. The free civilian service has a 10-meter location-tracking accuracy, synchronizes clocks with an accuracy of 10 nanoseconds, and measures speeds to within 0.2 m/s. The restricted military ... | Aside from the licensed service to Japanese civilians, what is the other level of service provided? | {
"text": [],
"answer_start": []
} | Aside from the licensed service to [MASK] civilians, what is the other level of service provided? | [
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... |
5acd460607355d001abf3ba6 | BeiDou_Navigation_Satellite_System | There are two levels of service provided — a free service to civilians and licensed service to the Chinese government and military. The free civilian service has a 10-meter location-tracking accuracy, synchronizes clocks with an accuracy of 10 nanoseconds, and measures speeds to within 0.2 m/s. The restricted military ... | The paid civilian service offers which features? | {
"text": [],
"answer_start": []
} | The paid civilian service offers which features? | [
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5acd460607355d001abf3ba7 | BeiDou_Navigation_Satellite_System | There are two levels of service provided — a free service to civilians and licensed service to the Chinese government and military. The free civilian service has a 10-meter location-tracking accuracy, synchronizes clocks with an accuracy of 10 nanoseconds, and measures speeds to within 0.2 m/s. The restricted military ... | The service licensed to Japanese government has a location accuracy of what? | {
"text": [],
"answer_start": []
} | The service licensed to [MASK] government has a location accuracy of what? | [
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5acd460607355d001abf3ba8 | BeiDou_Navigation_Satellite_System | There are two levels of service provided — a free service to civilians and licensed service to the Chinese government and military. The free civilian service has a 10-meter location-tracking accuracy, synchronizes clocks with an accuracy of 10 nanoseconds, and measures speeds to within 0.2 m/s. The restricted military ... | The paid civilian service has a location tracking accuracy of how many meters? | {
"text": [],
"answer_start": []
} | The paid civilian service has a location tracking accuracy of how many meters? | [
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5acd46c207355d001abf3bc2 | BeiDou_Navigation_Satellite_System | Frequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within E1 and E2 bands, which are allocated for G... | Frequencies for COMPASS overlap with Genesis and are allocated in how many bands? | {
"text": [],
"answer_start": []
} | Frequencies for COMPASS overlap with [MASK] and are allocated in how many bands? | [
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5acd46c207355d001abf3bc3 | BeiDou_Navigation_Satellite_System | Frequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within E1 and E2 bands, which are allocated for G... | Which countries satellites will transmit in E3 before Galileo satellites? | {
"text": [],
"answer_start": []
} | Which countries satellites will transmit in [MASK] before [MASK] satellites? | [
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5acd46c207355d001abf3bc4 | BeiDou_Navigation_Satellite_System | Frequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within E1 and E2 bands, which are allocated for G... | Which countries satellites will transmit in E3 before COMPASS satellites? | {
"text": [],
"answer_start": []
} | Which countries satellites will transmit in E3 before [MASK] satellites? | [
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5acd46c207355d001abf3bc5 | BeiDou_Navigation_Satellite_System | Frequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within E1 and E2 bands, which are allocated for G... | Frequencies for NASA are allocated in how many bands? | {
"text": [],
"answer_start": []
} | Frequencies for [MASK] are allocated in how many bands? | [
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5acd46c207355d001abf3bc6 | BeiDou_Navigation_Satellite_System | Frequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within E1 and E2 bands, which are allocated for G... | Aside from B3, E1 and E34, what is the other band of frequency used by COMPASS? | {
"text": [],
"answer_start": []
} | Aside from B3, E1 and [MASK], what is the other band of frequency used by [MASK]? | [
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0.0331638865172863,
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-0... |
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