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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate t he word that differs from the other three in the position of primary stress in each of the following questions.
A. economics
B. marmalade
C. oceanic
D. presidential Đáp án là: B. marmalade </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Este X hai chức, mạch hở, tạo bởi một ancol no với hai axit cacboxylic no, đơn chức. Este Y ba chức, mạch hở, tạo bởi glixerol với một axit cacboxylic không no, đơn chức (phân tử có hai liên kết π). Đốt cháy hoàn toàn m gam hỗn hợp E gồm X và Y cần vừa đủ 0,5 mol O 2 thu được 0,45 mol CO 2. Mặt khác, thủy phân hoàn toàn 0,16 mol E cần vừa đủ 210 ml dung dịch NaOH 2M, thu được hai ancol (có cùng số nguyên tử cacbon trong phân tử) và hỗn hợp ba muối, trong đó tổng khối lượng muối của hai axit no là (a) gam. Giá trị của (a) là
A. 10,68.
B. 20,60.
C. 12,36.
D. 13,20 Đáp án là: C. 12,36. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: She went _______ a bad cold just before Christmas.
A. down with
B. in for
C. over
D. through Đáp án là: A. down with </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đặt vào hai đầu một cuộn cảm thuần có độ tự cảm 0, 3 π (H) một điện áp xoay chiều. Biết điện áp có giá trị tức thời 60 6 (V) thì dòng điện có giá trị tức thời 2 (A) và khi điện áp có giá trị tức thời 60 2 (V) thì dòng điện có giá trị tức thời 6 (A). Hãy tính tần số của dòng điện.
A. 120 (Hz).
B. 50 (Hz).
C. 100 (Hz).
D. 60 (Hz). Đáp án là: C. 100 (Hz). </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hai con lắc đơn A, B có cùng khối lượng vật nặng, chiều dài dây treo tương ứng là l A và lB với 16l A = 9l B, dao động với cơ năng như nhau tại một nơi trên Trái Đất. Nếu biên độ của con lắc A là 3,6 o thì biên độ của con lắc B là:
A. 4,8 o.
B. 2,4 o.
C. 6,4 o.
D. 2,7 o. Đáp án là: D. 2,7 o </s> | [
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<s> Chọn đáp án đúng với câu hỏi: An chia đều 35 cái kẹo vào 5 túi. Hỏi mỗi túi có bao nhiêu cái kẹo?
A. 7 cái
B. 8 cái
C. 4 cái
D. 5 cái Đáp án là: A. 7 cái </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số trung bình của mẫu số liệu: 2; 3; 4; 5; 6; 7; 8 là
A. 2
B. 3
C. 3
D. 4 Đáp án là: D. 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Căn cứ vào Atlat Địa lí Việt Nam trang 18, cho biết nhận xét nào sau đây không đúng với nông nghiệp nước ta?
A. Chè được trồng nhiều ở Trung du và miền núi Bắc Bộ, Tây Nguyên.
B. Cà phê được trồng nhiều ở các tỉnh Tây Nguyên và Đông Nam Bộ.
C. Trâu được nuôi nhiều ở Trung du và miền núi Bắc Bộ, Bắc Trung Bộ.
D. Dừa được trồng nhiều ở Đồng bằng sông Cửu Long và Tây Nguyên. Đáp án là: D. Dừa được trồng nhiều ở Đồng bằng sông Cửu Long và Tây Nguyên </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate t he word that differs from the other three in the position of primary stress in each of the following questions.
A. lemon
B. physics
C. decade
D. decay Đáp án là: D. decay </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho 3,75 gam amino axit X tác dụng vừa hết với dung dịch NaOH thu được 4,85 gam muối. Công thức của X là
A. H 2 N–CH(CH 3 )–COOH
B. H 2 N–(CH 2 ) 2 –COOH
C. H 2 N–(CH 2 ) 3 –COOH
D. H 2 N–CH 2 –COOH Đáp án là: D. H 2 N–CH 2 –COOH </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nitơ trong thiên nhiên là hỗn hợp gồm hai đồng vị có % về số nguyên tử tương ứng là N 7 14 (99,63%) và N 7 15 (0,37%). Nguyên tử khối trung bình của nitơ là
A. 14,7.
B. 14,0.
C. 14,4.
D. 13,7. Đáp án là: B. 14,0. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Điện năng truyền tỉ từ nhà máy đến một khu công nghiệp bằng đường dây tải một pha. Nếu điện áp truyền đi là U thì ở khu công nghiệp phải lắp một máy hạ áp có tỉ số vòng dây 54:1 để đáp ứng 12:13 nhu cầu điện năng khu công nghiệp. Nếu muốn cung cấp đủ điện cho khu công nghiệp thì điện áp truyền đi phải là 2U và cần dùng máy biến áp với tỉ số là
A. 117/1.
B. 119/3.
C. 171/5.
D. 219/4. Đáp án là: A. 117/1. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: A. skating B. status C. stadium D. statue
A. skating
B. status
C. stadium
D. statue Đáp án là: D. statueA </s> | [
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1,
1,
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1,
1,
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1,
1,
1,
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1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
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<s> Chọn đáp án đúng với câu hỏi: Cho bột sắt đến dư vào dung dịch AgNO 3, thu được dung dịch X. Trong các chất sau: Cl 2, Cu, Fe, HCl, NaNO 3, NaOH, số chất tác dụng được với dung dịch X là
A. 2
B. 4
C. 5
D. 3 Đáp án là: D. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Công thức phân tử của đimetylamin là
A. C 4 H 11 N
B. C 2 H 6 N 2
C. C 2 H 6 N
D. C 2 H 7 N Đáp án là: D. C 2 H 7 N </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trước Chiến tranh thế giới thứ hai, hầu hết các nước Đông Nam Á (trừ Thái Lan) đều là thuộc địa của
A. đế quốc Tây Âu và Mĩ.
B. Anh, Pháp, Tây Ban Nha, Nhật Bản.
C. Anh, Pháp, Đức, Bỉ.
D. Anh, Pháp, Tây Ban Nha, Nhật Bản, Trung Quốc. Đáp án là: A. đế quốc Tây Âu và Mĩ. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thành phần chính của đất sét là cao lanh, có công thức là xAl 2 O 3.ySiO 2.zH 2 O, trong đó tỉ lệ về khối lượng các oxit và nước tương ứng là 0,3696;0,4348; 0,1957. Công thức hóa học nào dưới đây là của cao lanh đã cho?
A.Al 2 O 3.2SiO 2.3H 2 O
B. Al 2 O 3.3SiO 2.2H 2 O
C. 3Al 2 O 3.SiO 2.2H 2 O
D. 2Al 2 O 3.SiO 2.3H 2 O Đáp án là: A.Al 2 O 3.2SiO 2.3H 2 O </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hai hệ thống phòng ngự mà Pháp thiết lập ở Việt Nam năm 1950 là
A. Tăng cường hệ thống phòng ngự trên đường số 4 và thiết lập “hành lang Đông Tây” (Hải Phòng, Hà Nội, Hoà Bình, Sơn La)
B. Xây dựng hệ thông phòng ngự ở đồng bằng Bắc Bộ và trung du
C. Lập phòng tuyến “boong ke” và “vành đai trắng” xung quanh trung du và đồng bằng Bắc Bộ
D. Tất cả đều sai Đáp án là: A. Tăng cường hệ thống phòng ngự trên đường số 4 và thiết lập “hành lang Đông Tây” (Hải Phòng, Hà Nội, Hoà Bình, Sơn La) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks Vietnamese footballing history has been rewritten by the country's U23 team, which secured a place in the final of the Asian Football Confederation Under-23 (AFC U23) Championship thanks to a dramatic victory (31)______ Qatar. The Qatari team, which had won all its previous matches in the (32)______, opened the score-board with a successful penalty in the first half. (33)______, Vietnam equalized halfway through the second half with a goal from Nguyen Quang Hai. The last few minutes of the second half saw Qatar take the lead, before Hai once again scored the equalizer for Vietnam to bring the match to (34)______ time, which ended goalless. In the penalty shootout, the Vietnamese team (35)______ victorious after successfully converting four out of its five penalty kicks, while keeper Bui Tien Dung managed to save two penalties from the Qatari side. Question 31:
A. from
B. over
C. on
D. to Đáp án là: B. over </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kế hoạch Đờlát đơ Tátxinhi do Pháp - Mĩ đề ra và thực hiện đã khai thác triệt để chiến thuật gì?
A. Khóa then cửa
B. Dùng người Việt đánh người Việt, lấy chiến tranh nuôi chiến tranh
C. Tập kích bất ngờ, ồ ạt
D. Tằm ăn lá Đáp án là: B. Dùng người Việt đánh người Việt, lấy chiến tranh nuôi chiến tranh </s> | [
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<s> Chọn đáp án đúng với câu hỏi: _________ of tissues is known as histology.
A. That is scientific studying
B. Studying scientific
C. The scientific study
D. To study scientifically Đáp án là: C. The scientific study </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hỗn hợp gồm hiđrocacbon X và oxi có tỉ lệ số mol tương ứng là 1:10. Đốt cháy hoàn toàn hỗn hợp trên thu được hỗn hợp khí Y. Cho Y qua dung dịch H 2 SO 4 đặc, thu được hỗn hợp khí Z có tỉ khối đối với hiđro bằng 19. Công thức phân tử của X là :
A. C 3 H 8
B. C 3 H 6
C. C 4 H 8
D. C 3 H 4 Đáp án là: C. C 4 H 8 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Why is it that many teenagers have the energy to play computer games until late at night but can't find the energy to get out of bed (1) ________ for school? According to a new report, today's generation of children are in danger of getting so (2)_______ sleep that they are putting their mental and physical health at (3)_______. Adults can easily survive on seven to eight hours' sleep a night, (4)_______teenagers require nine or ten hours. According to medical experts, one in five youngsters (5)________ anything between two and five hours' sleep a night less than their parents did at their age. Điền vào ô số 4
A. or
B. because
C. whereas
D. so Đáp án là: C. whereas </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hạt prôtôn có động năng 5,48 MeV được bắn vào hạt nhân Be 4 9 đứng yên gây ra phản ứng hạt nhân, sau phản ứng thu được hạt nhân Li 3 7 và hạt X. Biết hạt X bay ra với động năng 4 MeV theo hướng vuông góc với hướng chuyển động của hạt prôtôn tới ( lấy khối lượng các hạt nhân tính theo đơn vị u gần bằng số khối). Vận tốc của hạt nhân Li là:
A. 10,07.10 6 m/s.
B. 8,24.10 6 m/s.
C. 0,824.10 6 m/s.
D. 1,07.10 6 m/s. Đáp án là: A. 10,07.10 6 m/s. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: At no time did the two sides look likely to reach an agreement
A. The two sides had no time to reach an agreement. B. The two sides never looked likely to reach an agreement
B. The two sides never looked likely to reach an agreement
C. If the two sides had had time, they would have reached an agreement
D. The two sides never look like each other Đáp án là: B. The two sides never looked likely to reach an agreement </s> | [
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<s> Chọn đáp án đúng với câu hỏi: There are ______ that make children more likely to be wakeful at night.
A. several different factor
B. several different factors
C. a great deal of different factors
D. a great deal of different factor Đáp án là: B. several different factors </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best completes each of the following exchanges. Student A: I think everyone can do more to protect the environment. Student B: ______________
A. Yes, I don’t mind.
B. I wasn’t sure about that.
C. I often do too.
D. You can say that again. Đáp án là: D. You can say that again </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một vật dao động điều hòa với tần số 2,5 Hz và có biên độ 0,020 m. Vận tốc cực đại của nó bằng
A. 0,008 m/s.
B. 0,050 m/s.
C. 0,125 m/s.
D. 0,314 m/s. Đáp án là: D. 0,314 m/s </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở nữ giới không mang thai, hoocmôn prôgestêrôn do bộ phận nào tiết ra
A. Âm đạo
B. Tử cung
C. Thể vàng
D. Ống dẫn trứng Đáp án là: C. Thể vàng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho (5x+2)/(3xy^2):(10x+4)/(x^2y)=(...)/(6y). Đa thức thích hợp điền vào chỗ trống là
A. xy
B. x^2y
C. x^2
D. x Đáp án là: D. x </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ngày 8/9/1951, Nhật Bản kí kết với Mĩ
A. Hiệp ước phòng thủ chung Đông Nam Á
B. Hiệp ước an ninh Mĩ - Nhật
C. Hiệp ước phát triển kinh tế Mĩ - Nhật
D. Hiệp ước liên minh Nhật - Mĩ Đáp án là: B. Hiệp ước an ninh Mĩ - Nhật </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho tam giác ABC vuông tại A đường cao AH biết BH=4cm và CH=16cm cm độ dài đường cao AH bằng
A. 8 cm
B. 9 cm
C. 25 cm
D. 16 cm Đáp án là: A. 8 cm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tại một điểm M có một máy phát điện xoay chiều một pha có công suất phát điện và hiệu điện thế hiệu dụng ở hai cực của máy phát đều không đổi. Nối hai cực của máy phát với một trạm tăng áp có hệ số tăng áp là k đặt tại đó. Từ máy tăng áp điện năng được đưa lên dây tải cung cấp cho một xưởng cơ khí cách xa điểm M. Xưởng cơ khí có các máy tiện cùng loại công suất khi hoạt động là như nhau. Khi hệ số k = 2 thì ở xưởng cơ khí có tối đa 120 máy tiện cùng hoạt động. Khi hệ số k = 3 thì ở xưởng cơ khí có tối đa 125 máy tiện cùng hoạt động. Do xảy ra sự cố ở trạm tăng áp người ta phải nối trực tiếp dây tải điện vào hai cực của máy phát điện, khi đó ở xưởng cơ khí có thể cho tối đa bao nhiêu máy tiện cùng hoạt động. Coi rằng chỉ có hao phí trên dây tải điện là đáng kể. Điện áp và dòng điện trên dây tải điện luôn cùng pha.
A. 93
B. 102
C. 84
D. 66 Đáp án là: A. 93 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số thích hợp điền vào chỗ chấm để 15/21=(.....)/7 là:
A. 21
B. 15
C. 7
D. 5 Đáp án là: D. 5 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: What is this passage mostly about?
A. How long it takes for light from the sun to reach the earth
B. The importance of energy to human life and where energy comes from
C. Different types of non-renewable sources of energy
D. How fossil fuels were formed Đáp án là: B. The importance of energy to human life and where energy comes from </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Công nghiệp xay xát thường phân bố theo quy luật
A. ở những nơi đông dân cư.
B. ở vùng trồng lúa.
C. ở các thành phố lớn.
D. ở các vùng đồng bằng. Đáp án là: B. ở vùng trồng lúa. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Làm tròn số 1,(02) với độ chính xác 0,005 ta được:
A. 1,0;
B. 1,02;
C. 1,1;
D. 1,021. Đáp án là: B. 1,02; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nhận định nào không phải là hạn chế chủ yếu của Đồng bằng sông Hồng?
A. Chuyển dịch cơ cấu kinh tế còn chậm.
B. Chịu ảnh hưởng nhiều của những thiên tai.
C. Sức ép dân số đối với vấn đề phát triển kinh tế - xã hội.
D. Cơ sở vật chất – kĩ thuật chưa phát triển bằng các vùng khác. Đáp án là: D. Cơ sở vật chất – kĩ thuật chưa phát triển bằng các vùng khác </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Este CH 3 COOCH 3 có tên gọi là
A. etyl axetat
B. metyl axetat
C. etyl fomat
D. metyl metylat Đáp án là: B. metyl axetat </s> | [
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29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
12723,
5868,
29871,
29941,
4810,
29949,
3210,
29871,
29941,
1302,
301... | [
1,
1,
1,
1,
1,
1,
1,
1,
1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Giá trị của biểu thức B = 2020x^2000 y^2020 – 2021x^2020 y^2021 tại x = 1 và y = –1 là
A. B = –1;
B. B = 4041;
C. B = 2020;
D. B = 2021. Đáp án là: B. B = 4041; </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Ý nào nói đúng nhất thành công trong Truyện Kiều của Nguyễn Du?
A. Khắc họa nhân vật bằng thủ pháp ước lệ.
B. Khắc họa tính cách nhân vật qua miêu tả ngôn ngữ, ngoại hình, cử chỉ.
C. Miêu tả đời sống nội tâm của nhân vật qua ngôn ngữ độc thoại và nghệ thuật tả cảnh ngụ tình.
D. Luôn đặt nhân vật vào khung cảnh thiên nhiên tươi đẹp. Đáp án là: C. Miêu tả đời sống nội tâm của nhân vật qua ngôn ngữ độc thoại và nghệ thuật tả cảnh ngụ tình. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho mặt phẳng (P): x - 2y +3z -1 = 0. Một véctơ pháp tuyến của mặt phẳng là (P)
A. n→=(1;2;3).
B. n→=(1;−2;3).
C. n→=(1;3;−2).
D. n→=(1;−2;−3). Đáp án là: B. n→=(1;−2;3). </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ankin là những hiđrocacbon không no, mạch hở, có công thức chung là
A. C n H 2n+2 (n ≥1).
B. C n H 2n (n ≥2).
C. C n H 2n-2 (n ≥2).
D. C n H 2n-6 (n ≥6). Đáp án là: C. C n H 2n-2 (n ≥2). </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Sục t ừ từ 7,84 lít khí CO 2 (đktc) vào 1 lít dung dịch X chứa NaOH 0,2M và Ca( oh ) 2 0,1M thì lượng kết tủa thu được là
A. 0 gam.
B. 5 gam.
C. 10 gam.
D. 15 gam. Đáp án là: B. 5 gam. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phân tích đa thức 4x^2– 9 thành nhân tử được kết quả là:
A. (4x – 9)(4x + 9);
B. (2x – 3)(2x + 3);
C. (2x – 9)(2x + 9);
D. Đáp án khác. Đáp án là: B. (2x – 3)(2x + 3); </s> | [
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<s> Chọn đáp án đúng với câu hỏi: _________we work with her, we get confused because of her fast speaking pace.
A. So that
B. Although
C. Whenever
D. Lest Đáp án là: C. Whenever </s> | [
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<s> Chọn đáp án đúng với câu hỏi: A. automobile B. epidemic C. medieval D. manufacture
A. automobile
B. epidemic
C. medieval
D. manufacture Đáp án là: A. automobile </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn từ có cách phát âm ở phần gạch chân khác với các từ còn lại:
A. bamb oo
B. g oo d
C. f oo t
D. c oo k Đáp án là: A. bamb oo </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Businesses will not survive ______ they satisfy their customers.
A. or else
B. in case
C. unless
D. if Đáp án là: C. unless </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ngành công nghiệp nào sau đây phát triển mạnh ở Trung Quốc nhờ lực lượng lao động dồi dào?
A. Chế tạo máy.
B. Sản xuất ô tô.
C. Dệt may.
D. Hóa chất. Đáp án là: C. Dệt may. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dẫn luồng khí CO qua hổn hợp Al 2 O 3, MgO, Fe 2 O 3, CuO (nóng) sau khi phản ứng xảy ra hoàn toàn thu được chất rắn là
A. Al 2 O 3, MgO, Fe, Cu
B. Al,Fe,Cu,Mg
C. Al 2 O 3, Mg, Fe, Cu
D. Al 2 O 3, MgO, Fe 3 O 4, Cu Đáp án là: A. Al 2 O 3, MgO, Fe, Cu </s> | [
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<s> Chọn đáp án đúng với câu hỏi: What is one reason for the change in the length of the workweek for the average worker in the United States during the 1930's?
A. Several people sometimes shared a single job.
B. Labor strikes in several countries influenced labor policy in the United states.
C. Several corporations increased the length of the workweek.
D. The United States government instituted a 35-hour workweek. Đáp án là: A. Several people sometimes shared a single job. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Choose a word in each line that has different stress pattern.
A. handicraft
B. cultural
C. museum
D. sculpture Đáp án là: C. museum </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho đường thẳng d có phương trình (m – 2)x + (3m – 1)y = 6m + 2. Tìm các giá trị của tham số m để d song song với trục tung.
A. m=1/3
B. m=2/3
C. m≠2
D. m≠1/3 Đáp án là: A. m=1/3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn đáp án đúng nhất. Hàm số y = ax + b là hàm số nghịch biến khi:
A. a = 0
B. a < 0
C. a > 0
D. a ≠ 0 Đáp án là: B. a < 0 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: L ò nung trao đổi năng lượng với vật khác dưới dạng nào sau đây?
A. Thực hiện công.
B. Truyền nhiệt.
C. Phát ra các tia nhiệt.
D. Không trao đổi năng lượng. Đáp án là: B. Truyền nhiệt. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các khẳng định sau, khẳng định nào đúng?
A. Điểm O(0 ; 0) thuộc miền nghiệm của hệ bất phương trình \(\left\{ \begin{array}{l} - x + 3y \ge 0\\2x \le 0\end{array} \right.\)
B. Điểm M(1 ; 0) thuộc miền nghiệm của hệ bất phương trình \(\left\{ \begin{array}{l} - x + 3y \ge 0\\2x \le 0\end{array} \right.\)
C. Điểm N(0 ; –1) thuộc miền nghiệm của hệ bất phương trình \(\left\{ \begin{array}{l} - x + 3y \ge 0\\2x \le 0\end{array} \right.\)
D. Điểm P(1 ; 1) thuộc miền nghiệm của hệ bất phương trình \(\left\{ \begin{array}{l} - x + 3y \ge 0\\2x \le 0\end{array} \right.\). Đáp án là: A. Điểm O(0 ; 0) thuộc miền nghiệm của hệ bất phương trình \(\left\{ \begin{array}{l} - x + 3y \ge 0\\2x \le 0\end{array} \right.\) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các nhận định sau nhận định nào đúng:
A. Mặc dù độ âm điện của photpho nhỏ hơn nitơ nhưng photpho hoạt động hóa học mạnh hơn nitơ là do liên kết trong phân tử photpho kém bền hơn trong phân tử nitơ
B. Nitơ hoạt động hóa học yếu hơn photpho là do nitơ có độ âm điện kém hơn photpho
C. Ở nhiệt độ thường Nitơ và photpho đều trơ về mặt hóa học
D. Nit ơ có độ âm điện nhỏ hơn photpho nên hoạt động hóa học mạnh hơn Đáp án là: A. Mặc dù độ âm điện của photpho nhỏ hơn nitơ nhưng photpho hoạt động hóa học mạnh hơn nitơ là do liên kết trong phân tử photpho kém bền hơn trong phân tử nitơ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Điều nào sau đâu không đúng
A. Điện tích của electron và protron có độ lớn bằng nhau
B. Dụng cụ để đo điện tích của một vật là ampe kế
C. Điện tích có hai loại là điện tích dương và điện tích âm
D. Đơn vị đo của điện tích là Cu – lông ( trong hệ SI) Đáp án là: B. Dụng cụ để đo điện tích của một vật là ampe kế </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các chất sau: metan, etilen, but-2-in và axetilen. Kết luận nào sau đây là đúng?
A. Có 2 chất tạo kết tủa với dung dịch AgNO 3 trong NH 3.
B. Có 3 chất làm mất màu dung dịch Br 2.
C. Cả 4 chất đều làm mất màu dung dịch Br 2.
D. Không có chất nào làm mất màu dung dịch KMnO 4. Đáp án là: B. Có 3 chất làm mất màu dung dịch Br 2. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hòa tan 1 gam một mẫu quặng chứa Au vào hỗn hợp cường thủy có dư, sau khi vàng hòa tan hoàn toàn thấy tiêu tốn 0,002 mol HNO 3. Khối lượng Zn tối thiểu cần dùng để thu hồi lượng Au từ dung dịch thu được là:
A. 0,195 gam.
B. 0,065 gam.
C. 0,130 gam.
D. 0,65 gam. Đáp án là: A. 0,195 gam. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Giới nguyên sinh bao gồm
A. Vi sinh vật, động vật nguyên sinh
B. Vi sinh vật, tảo, nấm, động vật nguyên sinh
C. Tảo, nấm, động vật nguyên sinh
D. Tảo, nấm nhày, động vật nguyên sinh Đáp án là: D. Tảo, nấm nhày, động vật nguyên sinh </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Certain chemicals have been banned because of their damaging affect on the environment. However, many farmers are still using them on their farm.
A. have been banned
B. affect
C. the
D. However, Đáp án là: B. affect </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hợp chất nào sau đây vừa chứa nhóm chức este vừa chứa vòng benzen trong phân tử?
A. Phenyl axetat
B. phenyl amoniclorua
C. Anilin
D. Axit benzoic Đáp án là: A. Phenyl axetat </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vai trò nào sau đây không phải của ngành giao thông vận tải?
A. Đảm bảo cho các quá trình sản xuất xã hội diễn ra liên tục, bình thường.
B. Tạo nên mối giao lưu kinh tế giữa các nước trên thế giới.
C. Đảm bảo nhu cầu tiêu dùng trong nước.
D. Đảm bảo nhu cầu đi lại của nhân dân. Đáp án là: C. Đảm bảo nhu cầu tiêu dùng trong nước. </s> | [
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2987... | [
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<s> Chọn đáp án đúng với câu hỏi: Thủy phân hoàn toàn tripeptit X mạch hở, thu được glyxin và analin. Số công thức cấu tạo có thể có của X là:
A. 4
B. 3
C. 6
D. 5 Đáp án là: C. 6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trở ngại chính đối với việc xây dựng và khai thác hệ thống giao thông vận tải đường bộ nước ta là
A. phần lớn lãnh thổ là địa hình đồi núi.
B. mạng lưới sông ngòi dày đặc
C. thiếu vốn và cán bộ kỹ thuật cao.
D. khí hậu và thời tiết thất thường. Đáp án là: A. phần lớn lãnh thổ là địa hình đồi núi. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Âm thanh truyền trong không khí với vận tốc 330m/s. Quãng đường âm thanh truyền đi được trong 0,5 phút là:
A. 165m
B. 660m
C. 11 m.
D. 9,9km. Đáp án là: D. 9,9km </s> | [
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<s> Chọn đáp án đúng với câu hỏi: At night they used to entertain ______ by telling and acting out stories.
A. themselves
B. them
C. their
D. themself Đáp án là: A. themselves </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Để thực hiện kế hoạch Na-va, Pháp đã tập trung ở Bắc Bộ một lực lượng cơ động mạnh lên đến bao nhiêu tiểu đoàn?
A. 40 tiểu đoàn.
B. 44 tiểu đoàn.
C. 46 tiểu đoàn.
D. 84 tiểu đoàn. Đáp án là: B. 44 tiểu đoàn. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất nào sau đây không phải là sản phẩm cộng giữa dung dịch brom và isopren (theo tỉ lệ mol 1:1)?
A. CH 2 BrC(CH 3 )BrCH=CH 2
B. CH 2 BrC(CH 3 )=CHCH 2 Br
C. CH 2 BrCH=CHCH 2 CH 2 Br
D. CH 2 =C(CH 3 )CHBrCH 2 Br Đáp án là: C. CH 2 BrCH=CHCH 2 CH 2 Br </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. The USA is encouraging Americans to wear face masks.There has been a lot of talk about whether or not face masks are effective in helping slow down the (25) ______ of the COVID -19 coronavirus.The government is set to encourage Americans to use homemade face covering like cloth masks, bandanas and scarves.At first, the WHO and some health organizations recommended that people (26) ______ were not sick didn’t need to wear masks or cover their faces. (27) ______, it is now proved that face masks can work effectively.They point to countries like Singapore and South Korea, where people wear masks and reported infection (28) ______ are lower. There has been a lot of talk about whether or not face masks are effective in helping slow down the (25) ______ of the COVID -19 coronavirus.
A. release
B. widening
C. lengthening
D. spread Đáp án là: D. spread </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Các đô thị thời Pháp thuộc có chức năng chủ yếu là
A. Thương mại, du lịch.
B. Hành chính, quân sự.
C. Du lịch, công nghiệp.
D. Công nghiệp, thương mại. Đáp án là: B. Hành chính, quân sự. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Giai đoạn Cổ kiến tạo bắt đầu từ kỉ nào dưới đây?
A. Jura.
B. Triat.
C. Cacbon.
D. Cambri. Đáp án là: D. Cambri </s> | [
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<s> Chọn đáp án đúng với câu hỏi: This has been called the "fight or flight" (64) ________, meeting danger by fighting it or running away.
A. reactionary
B. reactor
C. reaction
D. reacting Đáp án là: C. reaction </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn khẳng định đúng trong các khẳng định sau.
A. Độ dài của các cạnh bên trong hình chóp tam giác đều là khác nhau;
B. Độ dài của các cạnh bên của hình chóp tam giác đều bằng với độ dài cạnh đáy;
C. Các cạnh bên của hình chóp tam giác đều có độ dài bằng nhau;
D. Độ dài của các cạnh bên của hình chóp tam giác đều bằng với độ dài trung đoạn. Đáp án là: C. Các cạnh bên của hình chóp tam giác đều có độ dài bằng nhau; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đặc điểm của phản ứng thủy phân este trong môi trường axit là phản ứng
A. không thuận nghịch
B. luôn sinh ra axit và ancol
C. thuận nghịch
D. xảy ra hoàn toàn Đáp án là: C. thuận nghịch </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Lí do cơ bản nhất khiến Nhật Bản đi theo con đường quân phiệt hóa bộ máy nhà nước là do quốc gia này
A. có truyền thống quân phiệt hiếu chiến.
B. bị ảnh hưởng nặng nề nhất bởi khủng hoảng kinh tế (1929 – 1933).
C. c ó ít thuộc địa, thiếu vốn, nguyên liệu và thị trường tiêu thụ.
D. chính phủ Nhật Bản suy yếu, không đủ khả năng lãnh đạo đất nước. Đáp án là: C. c ó ít thuộc địa, thiếu vốn, nguyên liệu và thị trường tiêu thụ. </s> | [
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1,
1,
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1,
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1,
1,
1,
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1,
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1,
1,
1,
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<s> Chọn đáp án đúng với câu hỏi: Phản ứng hóa học không tạo ra dung dịch có màu là
A. glixerol với Cu(OH) 2.
B. dung dịch axit axetic với Cu(OH) 2.
C. dung dịch lòng trắng trứng với Cu(OH) 2.
D. Glyxin với dung dịch NaOH. Đáp án là: D. Glyxin với dung dịch NaOH </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nam often _______________ fishing on the weekend.
A. go
B. goes
C. is going
D. going Đáp án là: B. goes </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói đến chức năng quan của nhân tế bào, có bao nhiêu phát biểu đúng? I. Chứa đựng thông tin di truyền. II. Tổng hợp nên ribôxôm. III. Trung tâm điều khiển mọi hoạt động sống của tế bào. IV. Chứa NST.
A. 1.
B. 2.
C. 3.
D. 4. Đáp án là: D. 4 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Một khối gỗ hình lập phương có cạnh 3dm. Thì thể tích khối gỗ đó là:
A. 9 dm^3
B. 6 dm^3
C. 24 dm^3
D. 27 dm^3 Đáp án là: D. 27 dm^3 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Trộn các cặp dung dịch các chất sau với nhau : 1) MgSO 4 + HCl.2) AgNO 3 + KCl.3) NaOH + AlCl 3. Số phản ứng không xảy ra là :
A. 0.
B. 2.
C. 1.
D. 3. Đáp án là: C. 1. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Vật sáng AB đạt cách thấu kính phân kì một khoảng 20cm cho ảnh A’B’ = AB/4. Tìm khoảng cách từ ảnh A’B’ đến thấu kính?
A. 40 cm
B. 10cm
C. 80 cm
D. 5cm Đáp án là: D. 5cm </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Một êlectron bay vào từ trường đều có độ lớn cảm ứng từ B = 3.10 -4 T theo phương song song với vectơ cảm ứng từ. Vận tốc của êlectron bằng 3.10 6 m/s. Biết điện tích của êlectron q 0 = -1,6.10 -19 C. Độ lớn của lực Lo-ren-xơ tác dụng lên êlectron là
A. 9,6.10 -18 N.
B. 2,4.10 -18 N.
C. 4,8.10 -18 N.
D. 0 N. Đáp án là: D. 0 N </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Many people feel that we are already too (64) _________on computers.
A. dependent
B. based
C. influenced
D. carried Đáp án là: A. dependent </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Có 3 mẫu hợp kim: Cu-Ag ; Cu-Al ; Cu-Zn. Chỉ dùng 1 dung dịch axit thông dụng và 1 dung dịch bazơ thông dụng nào sau đây để phân biệt được 3 mẫu hợp kim trên?
A. HCl và NaOH.
B. HNO 3 và NH 3.
C. H 2 SO 4 và NaOH.
D. H 2 SO 4 loãng và NH 3 Đáp án là: D. H 2 SO 4 loãng và NH 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một chiếc bình thủy tinh đựng 1 ngôi sao giấy màu tím, 1 ngôi sao giấy màu xanh, 1 ngôi sao giấy màu vàng, 1 ngôi sao giấy màu đỏ. Các ngôi sao có kích thước và khối lượng như nhau. Lấy ngẫu nhiên 1 ngôi sao từ trong bình. Cho biến cố Y: “Lấy được 1 ngôi sao màu tím hoặc màu đỏ”. Xác suất của biến cố Y là:
A. 1/4;
B. 1/2;
C. 1/5;
D. 1. Đáp án là: B. 1/2; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thành phần của thuốc nổ đen là :
A. 75% NaNO 3 ; 15%S; 10% C.
B. 75% KNO 3 ; 15%S; 10% C.
C. 75% NaNO 3 ; 10% S; 15% C.
D. 75% KNO 3 ; 10%S; 15% C. Đáp án là: D. 75% KNO 3 ; 10%S; 15% C </s> | [
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<s> Chọn đáp án đúng với câu hỏi: This place is famous _______ its beautiful landscape and friendly inhabitants.
A. to
B. for
C. at
D. with Đáp án là: B. for </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Đốt cháy hoàn toàn 1 mol chất béo (triglixerit), thu được lượng CO 2 và H 2 O hơn kém nhau 4 mol. Mặt khác a mol chất béo trên tác dụng tối đa với 600 ml dung dịch Br 2 1M. Giá trị của a là
A. 0,15
B. 0,6
C. 0,30
D. 0,20 Đáp án là: C. 0,30 </s> | [
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1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cho Elip (x^2)/100+(y^2)/36=1. Qua một tiêu điểm của elip dựng đường thẳng song song với trục Oy và cắt elip tại hai điểm M và N. Độ dài MN là:
A. 48/5;
B. 36/5;
C. 25
D. 25/2. Đáp án là: B. 36/5; </s> | [
1,
1,
29871,
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30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
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30030,
865,
325,
31280,
29875,
274,
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29875,
29901,
14542,
382,
3466,
313,
29916,
29985,
29906,
6802,
29896,
29900,
29900... | [
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1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Is English a _______ language in your country?
A. mother
B. official
C. living
D. old Đáp án là: A. mother </s> | [
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29901,
1317,
4223,
263,
903,
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1649,
4086,
297,
596,
4234,
29973,
13,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Tính nhanh: \[769:15 + 731:15\]
A. 100;
B. 20;
C. 200;
D. 10. Đáp án là: A. 100; </s> | [
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Số tự nhiên nhỏ nhất là?
A.0
B.1
C.2
D.3 Đáp án là: A.0 </s> | [
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Văn bản Tiếng nói của văn nghệ thành công với nghệ thuật gì?
A. Bố cục chặt chẽ, hợp lí, dẫn dắt tự nhiên.
B. Lối viết giàu hình ảnh.
C. Sử dụng nhiều dẫn chứng thơ văn, dẫn chứng thực tế.
D. Tất cả các phương án trên. Đáp án là: D. Tất cả các phương án trên </s> | [
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29901,
12549,
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137,
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9922,
207,
140,
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323,
347,
31500,
301... | [
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1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Có 6 chiếc túi gồm 2 chiếc màu xanh, 4 chiếc màu đỏ. Bỏ ngẫu nhiên vào sáu chiếc túi đó mỗi túi một chiếc bánh Pizza, trong đó có 2 chiếc hải sản, 4 chiếc phomai. Tìm xác suất để hai chiếc hải sản được bỏ vào 2 túi màu xanh.
A. 1/48.
B. 1/15.
C. 1/36.
D. 1/24. Đáp án là: B. 1/15. </s> | [
1,
1,
29871,
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29976,
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29901,
315,
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260,
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330... | [
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1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Nguyễn Dữ tạ thế ở đâu?
A.Thanh Hóa
B.Ninh Bình
C.Hà Nội
D.Hải Dương Đáp án là: A.Thanh Hóa </s> | [
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29901,
405,
2543,
4099,
31500,
30478,
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5334,
207,
158,
30478,
11062,
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1,
1,
1,
1,
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1,
1,
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1,
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Nhiệt phân hoàn toàn KNO 3 thu được các sản phẩm là
A. KNO 2, NO 2, O 2.
B. KNO 2, O 2.
C. KNO 2, NO 2.
D. K 2 O, NO 2, O 2. Đáp án là: B. KNO 2, O 2. </s> | [
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1374,
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31500,
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5089... | [
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Tìm phát biểu sai trong các chất sau
A. Etylamin dễ tan trong nước do có tạo liên kết hiđro với nướ C.
B. Nhiệt độ sôi của ancol cao hơn so với hi đ rocacbon có phân tử khối tương đương do có liên kết hi đ ro giữa các phân tử ancol.
C. Anilin không tan trong nướ C.
D. Ở điều kiện thường, m etylamin là chất lỏng có mùi khai, tương tự như amonia c. Đáp án là: D. Ở điều kiện thường, m etylamin là chất lỏng có mùi khai, tương tự như amonia c </s> | [
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29976,
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30030,
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29901,
18439,
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30103,
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289,
347,
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207,... | [
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1... |
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