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<s> Chọn đáp án đúng với câu hỏi: There are__________flights between Hanoi and London, but, __________of them are within our budget.
A. some - any
B. lots of - few
C. a few - whole
D. several - no Đáp án là: B. lots of - few </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở điều kiện thường, halogen nào sau đây ở trạng thái lỏng?
A. Flo.
B. Clo.
C. Brom.
D. Iôt. Đáp án là: C. Brom. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nội dung nào không phản ánh đúng ý nghĩa của cách mạng tư sản Anh thế kỉ XVII?
A. Lật đổ chế độ phong kiến tồn tại nhiều thế kỉ ở Anh
B. Mở đường cho chủ nghĩa tư bản phát triển mạnh mẽ
C. Có ý nghĩa trọng đại trong thời kì qua... | [
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<s> Chọn đáp án đúng với câu hỏi: The man ______ is the new manager.
A. wears a traditional suit
B. wearing a traditional suit
C. that wearing a traditional suit
D. worn a traditional suit Đáp án là: B. wearing a traditional suit </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Metyl acrylat không tác dụng được với chất nào sau đây?
A. Kim loại Na
B. Dung dịch NaOH, đun nóng
C. Nước Br 2
D. H 2 (xúc tác Ni, t°). Đáp án là: A. Kim loại Na </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vietnam has a lot of ________ players who won many gold medals in The 22 nd
A. outstanding
B. outstretching
C. outlying
D. outgoing Đáp án là: A. outstanding </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thân thể con người ỏ nhiệt độ 37°c phát ra bức xạ nào trong các bức xạ sau đây?
A. Bức xạ nhìn thấy
B. Tia Rơnghen
C. Tia hồng ngoại
D. Tia tử ngoại Đáp án là: C. Tia hồng ngoại </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Oxit Y của một nguyên tố X ứng với hóa trị II có thành phần % theo khối lượng của X là 42,86%. Trong các mệnh đề sau: (I) Y tan nhiều trong nước (II) Y có thể điều chế trực tiếp từ phán ứng của X với hơi nước nóng (III) Từ axit... | [
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<s> Chọn đáp án đúng với câu hỏi: Este A tạo bởi 2 axit cacboxylic X, Y đều mạch hở, không phân nhánh và ancol Z. Xà phòng hóa hoàn toàn a gam A bằng 190ml dung dịch NaOH xM, để trung hòa NaOH dư sau phản ứng cần dùng 80ml dung dịch HCl 0,25M, thu được dung dịch B. Cô cạn dung dịch... | [
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<s> Chọn đáp án đúng với câu hỏi: Một quả cầu có khối lượng 2,5kg được treo vào tường nhờ một sợi dây. Dây hợp với tường góc α = 60 o. Cho g = 9,8m/s 2 ; bỏ qua ma sát ở chỗ tiếp xúc giữa quả cầu và tường, lực căng T của dây treo là:
A. 49N
B. 12,25N
C. 24,5N
D.... | [
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<s> Chọn đáp án đúng với câu hỏi: Cuộc đấu tranh của nhân dân Nhật Bản trong những năm 30 của thế kỉ XX đã có ảnh hưởng như thế nào tới tình hình Nhật Bản?
A. Khiến cho cuộc khủng hoảng ở Nhật Bản thêm trầm trọng.
B. Góp phần làm thất bại âm mưu quân phiệt ho... | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn từ có phần gạch chân đọc khác với các từ còn lại
A. th o se
B. al o ne
C. al o ng
D. t o tal Đáp án là: C. al o ng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Without her teacher’s advice, she would never have written such a good essay.
A. Her teacher advised him and she didn't write a good essay.
B. Her teacher didn't advise her and she didn't write a good essay.
C. She wrote a good essay as her teacher gave her some advice.
D. If her teach... | [
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<s> Chọn đáp án đúng với câu hỏi: Kim loại vừa tác dụng với dd HCl vừa tác dụng được với dung dịch KOH
A. Fe, Al
B. Ag, Zn
C. Al, Cu
D. Al, Zn Đáp án là: D. Al, Zn </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Trên cùng một nửa mặt phẳng bờ là tia Ox có ∠xOy = 30°, ∠xOz = 65°, chọn phát biểu đúng trong các phát biểu sau:
A. Tia Ox nằm giữa hai tia Oy và Oz
B. Tia Oy nằm giữa hai tia Oz và Ox
C. Tia Oz nằm giữa hai tia Oy và Ox
D. Chưa thể kết luận được tia nào nằm giữa hai tia còn lại Đáp án... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho biết x^3 = 2p + 1 trong đó x là số tự nhiên, p là số nguyên tố. Tìm x.
A. x = 9
B. x = 7
C. x = 5
D. x = 3 Đáp án là: D. x = 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Bác Hồ sinh năm 1890 thuộc thế kỷ nào?
A. Thế kỷ XVII
B. Thế kỷ XVIII
C. Thế kỷ XIX
D. Thế kỷ XX Đáp án là: C. Thế kỷ XIX </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The cultural life of New Orleans is a synthesis of contributions by both black and white.
A. product
B. demonstration
C. reflection
D. combination Đáp án là: D. combination </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một cái xúc xích dạng hình trụ có đường kính đáy 2cm và chiều cao 6cm, giả sử bán mỗi cm^3 xúc xích là 500 đồng. Bạn An cần trả tiền để mua một gói 4 cái xúc xích. Số tiền gần đúng nhất cho 4 cái xúc xích là
A. 19 000 (đồng)
B. 76 000 (đồng)
C. 38 000 (đồng)
D. 30 000 (đồng) Đáp án là:... | [
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<s> Chọn đáp án đúng với câu hỏi: Sự trỗi dậy của Liên minh châu Âu (EU) có tác động như thế nào đến xu thế phát triển của thế giới sau chiến tranh lạnh?
A. Góp phần vào sự sụp đổ của trật tự hai cực Ianta
B. Thúc đẩy các quốc gia điều chỉnh chiến lược phá... | [
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<s> Chọn đáp án đúng với câu hỏi: Tìm nghiệm của phương trình 3x−5=9−4x
A.x=2
B.x=4/7
C.x=−4
D.x=−2 Đáp án là: A.x=2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn từ có phần gạch chân được phát âm khác.
A. h e lp
B. b e nefit
C. e lderly
D. gard e n Đáp án là: D. gard e n </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một quần thể đang ở trạng thái cân bằng di truyền có tần số alen A là 0,4. Theo lí thuyết, tần số kiểu gen AA của quần thể này là
A. 0,40.
B. 0,16
C. 0,60
D. 0,48. Đáp án là: B. 0,16 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Which is not referred to Jean?
A. She was a responsible girl.
B. She never helped her mother with household chores.
C. She often did well at school.
D. She went to high school. Đáp án là: A. She was a responsible girl. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The doctor’s records must be kept thorough and neatly so as to insure good book – keeping.
A. thorough
B. neatly
C. so as to
D. good Đáp án là: B. neatly </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Lựa chọn đáp án đúng nhất:Từ 3 số 1, 0, 4 viết được bao nhiêu số có 3 chữ số khác nhau chia hết cho 2 và 3?
A. 4
B. 3
C. 2
D. 0 Đáp án là: D. 0 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Lựa chọn đáp án đúng nhất:Một bể cá dạng hình lập phương có cạnh 1,2 m. Tính thể tích của bể cá đó.
A. 1,725m^3
B. 1,726m^3
C. 1,727m^3
D. 1,728m^3 Đáp án là: D. 1,728m^3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các chất sau: etyl fomat, anilin, glucozo, Gly – Ala. Số chất bị thủy phân trong môi trường kiềm là
A. 1
B. 2
C. 4
D. 3 Đáp án là: B. 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Calling Jim is pointless because his phone is out of order.
A. It’s useless calling Jim because his phone is out of order.
B. It’s no use to call Jim because his phone is out of order.
C. There’s no point calling Jim because his phone is out of order.
D. It’s worth not calling Jim beca... | [
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338,
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310,
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<s> Chọn đáp án đúng với câu hỏi: Tổ chức liên kết khu vực châu Âu đầu tiên được thành lập sau Chiến tranh thế giới thứ hai là tổ chức nào?
A. Cộng đồng than – thép châu Âu.
B. Cộng đồng năng lượng nguyên tử châu Âu.
C. Cộng đồng kinh tế châu Âu.
D. Liên mi... | [
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31... | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn đáp án đúng. Gia đình em mỗi tháng tiêu thụ hết 18 khối nước (1 khối = 1 m 3 ). Số lít nước nhà em tiêu thụ mỗi tháng là:
A. 18000 lít
B. 1800 lít
C. 180 lít
D. 18 lít Đáp án là: A. 18000 lít </s> | [
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2... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Vị trí vân sáng bậc k trong thí nghiêm giao thoa của Young được xác định bằng công thức:
A. x = k. λ. D a.
B. x = 2 k. λ. D a.
C. x = k. λ. D 2 a.
D. x = ( 2 k + 1 ). λ. D a. Đáp án là: A. x = k. λ. D a. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một con lắc lò xo mà vật nhỏ dao động được đặt trên giá đỡ cố định nằm ngang dọc theo trục lò xo. Hệ số ma sát trượt giữa giá đỡ và vật dao động là 0,1. Ban đầu giữ vật ở vị trí lò xo dãn một đoạn A rồi buông nhẹ để co... | [
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3... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Tế bào của một thai nhi có 47 NST, trong đó cặp NST giới tính có 3 chiếc giống nhau. Thai nhi sẽ phát triển thành:
A. Bé trai không bình thường
B. Bé gái không bình thường
C. Bé gái bình thường
D. Bé trai bình thường Đáp án là: B. Bé gái... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho biết: 5’XGU3’, 5’XGX3’ ; 5’XGA3’; 5’XGG3’ quy định Arg; 5’GGG3’, 5’GGA3’, 5’GGX3’, 5’GGU3’ quy định Gly. Một đột biến điểm xảy ra ở giữa alen làm cho alen A thành alen a, trong đó chuỗi mARN của alen a bị thay đổi cấu trúc ở một bộ ba dẫn tới ... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Một đám nguyên tử hiđrô đang ở trạng thái cơ bản. Khi chiếu bức xạ có tần số f 1 vào đám nguyên tử này thì chúng phát ra tối đa 3 bức xạ. Khi chiếu bức xạ có tần số f 2 vào đám nguyên tử này thì chúng phát ra tối đa 10 bức xạ... | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the word that has the underlined part pronounced differently from the rest
A. r i ce
B. p i pe
C. f i ll
D. appl i ance Đáp án là: C. f i ll </s> | [
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1090,
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<s> Chọn đáp án đúng với câu hỏi: Hướng gió chính vào mùa đông ở môi trường nhiệt đới gió mùa là
A. Tây Nam.
B. Đông Bắc.
C. Đông Nam.
D. Tây Bắc. Đáp án là: B. Đông Bắc. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Làm sao để người viết có được những tri thức đúng, phong phú và hữu ích về đối tượng được thuyết minh?
A. Hỏi han, nói chuyện với nhiều người
B. Dành nhiều thời gian quan sát, tìm hiểu về sự vật, hiện tượng
C. Nắm đươ... | [
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<s> Chọn đáp án đúng với câu hỏi: Nửa mặt phẳng là miền nghiệm của bất phương trình – x + 2 + 2(y – 2) < 2(1 – x) chứa điểm nào trong các điểm sau:
A. (0; 3);
B. (2; 1);
C. (4; 2);
D. (1; – 1). Đáp án là: D. (1; – 1) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Căn cứ vào bảng số liệu, cho biết nhận xét nào sau đây đúng về sản lượng thủy sản của nước ta, giai đoạn 2005 - 2014?
A. Khai thác tăng nhanh hơn nuôi trồng.
B. Nuôi trồng tăng nhiều hơn khai thác.
C. Khai thác luôn lớn hơn nuôi trồng... | [
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<s> Chọn đáp án đúng với câu hỏi: Điểm nổi bật nhất của chế độ phong kiến Trung Quốc dưới thời Tần, Hán là gì?
A. Trong xã hội hình thành hai giai cấp cơ bản là địa chủ và nông dân lĩnh canh
B. Chế độ phong kiến Trung Quốc hình thành và bước đầu được củng c... | [
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347,
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207,
140,
29885,
694,
31500,
207,
140,
29... | [
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<s> Chọn đáp án đúng với câu hỏi: Đoạn thẳng nối đỉnh với trung điểm của cạnh đối diện trong tam giác được gọi là:
A. Đường trung tuyến của tam giác
B. Đường phân giác của tam giác
C. Đường cao của tam giác
D. Đường trung trực của tam giác Đáp án là: A. Đường trung tuyến của tam giác </s> | [
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1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Điều kiện tự nhiên thuận lợi cho phát triển khai thác thuỷ sản ở nước ta là
A. Nhân dân có kinh nghiệm, truyền thống đánh bắt thuỷ sản.
B. Tàu thuyền, ngư cụ được trang bị ngày càng tốt hơn.
C. Có nhiều ngư trường, trong đó có... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Căn cứ vào Atlat Địa lí Việt Nam trang 15, đô thị có quy mô dân số (năm 2007) lớn thứ hai ở Đông Nam Bộ là:
A. Vũng Tàu.
B. TP. Hồ Chí Minh.
C. Thủ Dầu Một.
D. Biên Hòa. Đáp án là: D. Biên Hòa </s> | [
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2... | [
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<s> Chọn đáp án đúng với câu hỏi: Thành phần nào chiếm 55% thể tích của máu.
A. Hồng cầu
B. Bạch cầu
C. Huyết tương
D. Tiểu cầu Đáp án là: C. Huyết tương </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn phát biểu đúng trong các phát biểu sau:
A. Đường tròn tâm O, bán kính R là hình gồm các điểm cách O một khoảng bằng R, kí hiệu là (O; R).
B. Đường tròn tâm O, đường kính R là hình gồm các điểm cách O một khoảng bằng R, kí hiệu là (O; R).
C. Đường tròn tâm O, bán kính R là hình gồm... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Este E (C 8 H 8 O 2 ) có thành phần gồm gốc axit cacboxylic liên kết với nguyên tử cacbon của vòng benzen. Số đồng phân cấu tạo của E thỏa mãn là
A. 2.
B. 4.
C. 5.
D. 3. Đáp án là: B. 4. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Cho số phức z = 3+ 4i. Mệnh đề nào dưới đây là sai
A. z là số thực.
B. z ̄=3−4i
C. Phần ảo của số phức z bằng 4
D. (z)=5 Đáp án là: A. z là số thực. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho mẫu số liệu sau:
12; 2; 6; 13; 9; 21.
Tìm phương sai của mẫu số liệu trên (làm tròn đến hàng phần trăm).
A. 35,85;
B. 34,85;
C. 34,58;
D. 35,58. Đáp án là: D. 35,58 </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 correct answer to each of the following questions. In 1883, hundreds of workers of Western Union Telegraph Company ______________ for “equal pay for equal work” for its male and female employees.
A. gained
B. campaigned
... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho tam giác ABC có A(2; −1); B(4; 5) và C(−3; 2). Phương trình đường cao kẻ từ C của tam giác ABC là:
A. x + y – 1 = 0;
B. x + 3y – 3 = 0;
C. 3x + y + 11 = 0;
D. 3x – y + 11 = 0. Đáp án là: B. x + 3y – 3 = 0; </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Đốt cháy hoàn toàn 4,48 lít hỗn hợp gồm C 2 H 6 và C 3 H 8 (đkc) rồi cho sản phẩm cháy đi qua bình 1 đựng H 2 SO 4 đặc, bình 2 đựng dd nước vôi trong có dư thì thấy khối lượng bình 1 tăng m gam, bình 2 tăng 2,2 gam. Tính m.
A. 3,5
B. 4,5
C.... | [
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<s> Chọn đáp án đúng với câu hỏi: Một dây đồng có đường kính d = 0, 8 m m có phủ sơn cách điện mỏng quấn quanh một hình trụ đường kính D = 5 c m để tạo thành một ống dây. Khi nối ống dây với nguồn E = 4 V, r = 0, 5 Ω thì cảm ứng từ trong lòng ống dây là B = 5.10 -... | [
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<s> Chọn đáp án đúng với câu hỏi: Căn cứ vào Atlat Địa lí Việt Nam trang 17, tỉnh/thành phố nào dưới đây có GDP bình quân tính theo đầu người năm 2007 từ 12 -15 triệu đồng?
A. Bình Định.
B. Khánh Hòa.
C. Đồng Nai.
D. Quảng Ninh. Đáp án là: A. Bình Định. </s> | [
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Nội dung chính của câu văn sau là gì? “Nhưng hộ đã phải trả bằng một cái giá khá đắt cái vinh dự đột ngột ấy, vì để bảo vệ cho cái công lí và tự do mà chính họ không được hưởng một tí nào, họ đã phải đột ngột xa lìa vợ... | [
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1939,
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270,
686,
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2723... | [
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1,
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1,
1,
1,
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Trong các đặc điểm của hai con đường xâm nhập của ion khoáng vào mạch gỗ của rễ, đặc điểm nào sau đây không đúng?
A. Con đường gian bào vận chuyển nhanh.
B. Con đường tế bào chất vận chuyển chậm, có tính chọn lọc.
C. Con đường t... | [
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1,
1,
1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Khi mắc một bóng đèn vào hiệu điện thế 6V thì dòng điện chạy qua bóng đèn có cường độ 500mA. Công suất tiêu thụ của đèn này là
A. 3000W.
B. 300W.
C. 30W.
D. 3,0W. Đáp án là: D. 3,0W </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Part- time workers at the company are the first_________.
A. that is laid off
B. who lay off
C. being laid off
D. to be laid off Đáp án là: D. to be laid off </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the word which has the underlined part pronounced differently from the others.
A. l o se
B. v o te
C. contr o l
D. s o cial Đáp án là: A. l o se </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Only after she had finished the course did she realize she ______ a wrong choice.
A. had made
B. has made
C. had been making
D. was making Đáp án là: C. had been making </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất có nhiệt độ sôi thấp nhất là
A. C 2 H 5 OH
B. CH 3 CHO
C. CH 3 COOH
D. C 2 H 6 Đáp án là: D. C 2 H 6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thêm dung dịch HC l vào dung dịch hỗn h ợ p gồm 0, 1 mol NaOH và 0,1 mo l Na[Al(OH) 4 ] thu được 0,08 mo l chất kết tủa. Số mo l HC l đã thêm vào là
A. 0,16 mol
B. 0,18 hoặc 0,26 mo l
C. 0,08 hoặc 0,16 mol
D. 0,26 mol Đáp án là: B. 0,18 hoặc 0,26 mo l </s... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Khẩu phần ăn là lượng thức ăn cung cấp cho cơ thể trong
A. một đơn vị thời gian.
B. một tuần.
C. một bữa.
D. một ngày. Đáp án là: D. một ngày </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Lựa chọn đáp án đúng nhất: Thương của 2250 và 90 là bao nhiêu?
A. 250
B. 26
C. 25
D. 23 Đáp án là: C. 25 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các phát biểu sau đây: (1) Nhỏ từ từ cho đến dư dung dịch NaOH vào dung dịch AlCl 3 thu được kết tủa keo trắng. (2) Cho Na vào dung dịch CuSO 4 dư, dung dịch thu được chứa 2 muối. (3) Dùng bình nhôm để dụng axit clohidric đặc nguội. (4) ... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Cho 29,4 gam một α-amino axit mạch không phân nhánh X (có một nhóm - NH 2 ) tác dụng với dung dịch NaOH dư, thu được 38,2 gam muối. Mặt khác, khi cho 29,4 gam X phản ứng với dung dịch HCl dư, thu được 36,7 gam muối. Tên gọi của X là:
A. alanin
B.... | [
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<s> Chọn đáp án đúng với câu hỏi: Vỏ ngoài của virut là
A. Vỏ capsit
B. Các gai glicoprotein
C. Lớp lipit kép và protein bọc bên ngoài vỏ capsit
D. Nucleocapsit Đáp án là: C. Lớp lipit kép và protein bọc bên ngoài vỏ capsit </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong không gian với hệ trục tọa độ Oxyz, cho ba điểm A(1;2;-4), B(1;-3;1), C(2;2;3). Tính đường kính d của mặt cầu (S) đi qua ba điểm trên và có tâm nằm trên mặt phẳng (Oxy).
A. d =2√(13)
B. d =2√(41)
C. d = 2√(26)
D. d = 2√(11) Đáp án là: C. d = 2√(26) </s> | [
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Hình nào biểu diễn đúng hướng lực từ tác dụng lên một đoạn dây dẫn thẳng mang dòng điện I có chiều như hình vẽ đặt trong từ trường đều, đường sức từ có hướng như hình vẽ:
A.
B.
C.
D. Đáp án là: C. </s> | [
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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: Phát biểu nào sau đây không đúng về mối quan hệ hỗ trợ giữa các loài trong quần xã?
A. Quan hệ hỗ trợ bao gồm quan hệ cộng sinh, hợp tác và hội sinh.
B. Trong các mối quan hệ hỗ trợ, mỗi loài đều được hưởng lợi.
C. Một 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: Tính giá trị biểu thức sau: \[A = a\sin 90^\circ + b\cos 90^\circ + c\cos 180^\circ \].
A. a – b;
B. a + b – c;
C. a – b + c;
D. a − c. Đáp án là: D. a − c </s> | [
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1,
1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Cho 7,45 gam hỗn hợp X gồm các axit hữu cơ (phân tử chỉ chứa một loại nhóm chức) tác dụng hết với dung dịch NaHCO 3 dư, thấy giải phóng 3,36 lít khí CO 2 (đktc). Mặt khác, đốt cháy hoàn toàn 7,45 gam hỗn hợp X cần dùng vừa hết 2,52... | [
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1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Công thức nào đúng với tên gọi tương ứng:
A. a n c o l s e c - b u t y l i c : ( C H 3 ) 2 C H - C H 2 O H.
B. a n c o l i s o - a m y l i c : ( C H 3 ) 2 C H C H 2 C H 2 C H 2 O H.
C. a x i t p i c r i c : B r 3 C 6 H 2 O H.
D. p - c r e z o l : p - C H 3 - C 6 H 4 - O H.... | [
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1,
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1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Sự kiến đánh dấu Liên Xô phá vỡ thế độc quyền bom nguyên tử của Mĩ là
A. năm 1957 phóng thành công vệ tinh nhân tạo vào quỹ đạo trái đất.
B. năm 1972 thử thành công tên lửa hạt nhân.
C. năm 1949 Liên Xô ném bom hủy diệt Nhật Bản... | [
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Tripeptit X và tetrapeptit Y đều mạch hở. Khi thủy phân hoàn toàn hỗn hợp gồm X và Y chỉ tạo ra một amino axit duy nhất có công thức H 2 N C n H 2 n C O O H. Đốt cháy 0,05 mol Y trong oxi dư, thu được N 2 và 36,3 gam hỗn hợp gồm C O 2, H 2 O. Đo... | [
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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: An đã thực hiện một thí nghiệm đơn giản để ghi lại số lần mặt ngửa xuất hiện, tỉ lệ phần trăm: Gieo một đồng xu 5 lần và ghi lại kết quả như bảng bên:MặtSố lầnTỉ lệ phần trămMặt sấp360%Mặt ngửa250%Dữ liệu định lượng trong bảng là:
A. Mặt sấp, mặt ngửa;
B. 3; 2;
C. 60%; 50%;
D. Cả B và ... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Băng tuyết ở châu Nam Cực bị tan sẽ ảnh hưởng đến đời sống của con người trên Trái Đất như thế nào?
A. Không ảnh hưởng đến các hoạt động kinh tế của con người
B. Ảnh hưởng rất nhỏ đến các hoạt động kinh tế của con ngườ... | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Để đánh đổ ách thống trị của đế quốc Mĩ và chính quyền Sài Gòn, phương pháp đấu tranh bạo lực cách mạng lần đầu tiên được Đảng Lao động Việt Nam đề ra tại
A. Đại hội đại biểu toàn quốc lần thứ III của Đảng.
B. Kì họp thứ... | [
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1,
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Có bao nhiêu loại phân tử sau đây được cấu tạo từ các đơn phân là các nuclêôtit? I. Hoocmôn insulin. II. ARN pôlimeraza. III. ADN pôlimeraza. IV. Gen.
A. 3
B. 2
C. 1
D. 4 Đáp án là: C. 1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Polime nào sau đây thuộc loại polime thiên nhiên?
A. Polietilen.
B. Tơ olon.
C. Tơ tằm.
D. Tơ axetat. Đáp án là: C. Tơ tằm. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: N guyên tử nguyên tố X có tổng số hạt (p, n, e) là 76, trong đó số hạt mang điện nhiều hơn số hạt không mang điện là 20 hạt. Cấu hình electron nguyên tử của nguyên tố X là
A. [Ar] 3d 5 4s 1.
B. [Ar] 3d 4 4s 2.
C. [Ar] 4s 1 3d 5.
D. [Ar] 4s 2 3d ... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho y tỉ lệ nghịch với x theo hệ số tỉ lệ a. Với mỗi giá trị x_1, x_2 khác 0 của x, ta có một giá trị tương ứng y_1, y_2 của y. Khi đó:
A. (x_1)/(x_2)=(y_2)/(y_1)
B. (x_2)/(x_1)=(y_2)/(y_1)
C. (x_2)/(2x_1)=(y_2)/(y_1)
D. (x_1)/(x_2)=(y_1)/(y_2) Đáp án là: A. (x_1)/(x_2)=(y_2)/(y_1) </s... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hai số phức z_1 = 1 + i; z_2 = 4 - i. Tim số phức z=z12.z_2
A. z = 2 + 8i.
B. z = 2 - 8i.
C. z = 5 + 3i.
D. z = 3 + 3i. Đáp án là: A. z = 2 + 8i. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hợp chất hữu cơ có số nguyên tử hiđro bằng số nguyên tử Cacbon. Hợp chất này tham gia phản ứng thế brôm, không tham gia phản ứng cộng brôm. Hợp chất đó là:
A. Metan
B. Etilen
C. Axetilen
D. Benzen Đáp án là: D. Benzen </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong một mạch dao động LC, điện tích trên một bản tụ biến thiên theo phương trình: q = q 0 cos(ωt - π/2). Như vậy
A. tại thời điểm T/4 và 3T/4, dòng điện trong mạch có độ lớn cực đại, chiều như nhau
B. tại thời điểm T/4 và 3T/4, dòng đ... | [
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<s> Chọn đáp án đúng với câu hỏi: Phản ứng hạt nhân nào sau đây là phản ứng thu năng lượng?
A. Phản ứng nhiệt hạch
B. Phản ứng mà trong đó tổng độ hụt khối của các hạt nhân sinh ra lớn hơn tổng độ hụt khối của các hạt nhân tham gia phản ứng
C. Phản ứng mà trong ... | [
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<s> Chọn đáp án đúng với câu hỏi: Thế mạnh hàng đầu của vùng kinh tế trọng đểm miền Trung là
A. khai thác lãnh thổ theo chiều sâu.
B. khai thác tổng hợp tài nguyên biển, khoáng sản, rừng.
C. nguồn lao động đông, trình độ cao.
D. cơ sở hạ tầng hoàn thiện nhất cả nu... | [
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<s> Chọn đáp án đúng với câu hỏi: Thực vật chỉ có thể hấp thụ được nitrogen ở dạng
A. N 2 tự do trong khí quyển.
B. hợp chất vô cơ.
C. N 2 và NH 3.
D. NH 4 + và NO 3 -. Đáp án là: D. NH 4 + và NO 3 - </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Sự tiêu hoá ở dạ dày múi khế diễn ra như thế nào?
A. Tiết pepsin và HCl để tiêu hoá prôtêin có ở vi sinh vật và cỏ
B. Hấp thụ bớt nước trong thức ăn
C. Thức ăn được trộn với nước bọt và được vi sinh vật phá vỡ thành te... | [
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<s> Chọn đáp án đúng với câu hỏi: Cho tanα+cotα=m. Tìm m để tan^2α+cot^2α=7
A. m = 9
B. m = 3
C. m=−3
D. m=±3 Đáp án là: D. m=±3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi brom hóa một ankan chỉ thu được một dẫn xuất monobrom duy nhất có tỉ khối hơi đối với hiđro là 75,5. Tên của ankan đó là
A. 3,3-đimetylhexan
B. isopentan
C. 2,2,3-trimetylpentan
D. 2,2-đimetylpropan Đáp án là: D. 2,2-đimetylpropan </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kính hiển vi có vật kính với tiêu cự 0,1 cm, thị kính với tiêu cự 2 cm và độ dài quang học 18 cm. Mắt bình thường có điểm cực cận cách mắt 25 cm, mắt đặt tại tiêu điểm ảnh của thị kính. Xác định phạm vi đặt vật trước vật k... | [
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<s> Chọn đáp án đúng với câu hỏi: A day of leisure is the best gift of all for an American Mom?
A. It’s the best gift.
B. Lucky money
C. Yes, it is.
D. Well-done. Đáp án là: C. Yes, it is. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Những nguyên nhân nào sau đây làm huyết áp giảm dần trong hệ mạch? (1) Do lực ma sát của máu với thành mạch. (2) Do lực ma sát giữa các phân tử máu với nhau. (3) Do sự co bóp của tim ngày càng giảm. (4) Do độ dày của thành mạch giảm da... | [
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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 word that differs from the other three in the position ofprimary stress in each of the following questions.
A. technology
B. activity
C. experience
D. presentation Đáp án là: D. presentation </s> | [
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4485,
278,
5497,
319,
29892,
350,
29892,
315,
29892,
470,
360,
373,... | [
1,
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1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Từ m gam tinh bột điều chế ancol etylic bằng phương pháp lên men với hiệu suất của cả quá trình là 85%. Lượng CO 2 sinh ra từ quá trình trên được hấp thụ hoàn toàn vào dung dịch Ca(OH) 2 thu được 40g kết tủa và dung dịch X. Thêm dung ... | [
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31280,
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146,
29875,
29901,
12603,
207,
158,
30712,
286,
24988,
27773,
29882,
1045,
31214,
31500,... | [
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Chiều dài của con lắc lò xo treo thẳng đứng dao động điều hòa biến đổi từ 30cm tới 40cm. Độ cứng của lò xo là k = 100N/m. Khi lò xo có chiều dài 38cm thì lực đàn hồi tác dụng vào vật là 10N. Độ biến dạng lớn nhất của lò xo là:... | [
1,
1,
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30975,
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29871,
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29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
678,
347,
31500,
30712,
29884,
1146,
30712,
29875,
2723,
207,
140,
... | [
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Choose the letter A, B, C or D to complete the sentences with given words Can/ you/ list/ name/ all/ World’s Heritages?
A. Can you list the name of all World’s Heritages?
B. Can you list the name all the World’s Heritages?
C. Can you list name of all the World’s Heritages?
D. Can you l... | [
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1,
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678,
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29976,
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1715,
29871,
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30030,
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325,
31280,
29875,
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29884,
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29875,
29901,
14542,
852,
278,
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319,
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350,
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315,
470,
360,
304,
... | [
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1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Thấu kính hội tụ là loại thấu kính có
A. Phần rìa dày hơn phần giữa.
B. Phần rìa mỏng hơn phần giữa.
C. Phần rìa và phần giữa bằng nhau.
D. Hình dạng bất kì. Đáp án là: B. Phần rìa mỏng hơn phần giữa. </s> | [
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29875,
29901,
498,
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8506,
30103,
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5089,
312... | [
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1... |
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