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<s> Chọn đáp án đúng với câu hỏi: It is more difficult to learn to speak English than to learn to write it.
A. Learning to speak English is more difficult than to learn to write it.
B. Learning to speak English is as difficult as learning to write it.
C. Learning to speak English is more difficult than learning to write it.
D. Learning to speak English is not so difficult as learning to write it. Đáp án là: C. Learning to speak English is more difficult than learning to write it. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho A = {x ∈ R| x + 2 ≥ 0}, B = {x ∈ R| 5 – x ≥ 0}. Số các số nguyên thuộc cả hai tập A và B là:
A. 6
B. 8
C. 5
D. 3 Đáp án là: B. 8 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Though they work as a team, they often don’t ______ eye to eye on most issues.
A. see
B. make
C. have
D. keep Đáp án là: A. see </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Find the word which has a different stress pattern from the other.
A. stimulate
B. surgical
C. already
D. measurement Đáp án là: C. already </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Để thể hiện sự phân bố lượng mưa trung bình năm trên nước ta, người ta thường dùng
A. phương pháp kí hiệu.
B. phương pháp chấm điểm.
C. phương pháp bản đồ - biểu đồ.
D. phương pháp khoanh vùng Đáp án là: D. phương pháp khoanh vùng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tần Thuỷ Hoàng đã thống nhất lãnh thổ Trung Quốc (năm 221 TCN) thông qua con đường
A. chiến tranh.
B. ngoại giao.
C. luật pháp.
D. đồng hóa văn hóa. Đáp án là: A. chiến tranh. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Viết số thập phân 0,25 về dạng phân số ta được:
A. 1/4
B. 5/2
C. 2/5
D. 1/5 Đáp án là: A. 1/4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho mệnh đề A: “\[\forall x \in \mathbb{R},{x^2} - x + 7 < 0\]”. Mệnh đề phủ định của A là:
A. \[\overline{A}:''\forall x\in \mathbb{R},{{x}^{2}}-x+7>0''\];
B. \[\overline{A}:''\forall x\in \mathbb{R},{{x}^{2}}-x+7>0''\];
C. \[\overline{A}:''\exists x\in \mathbb{R},\,{{x}^{2}}-x+7<0''\];
D. \[\overline{A}:''\exists \,x\in \mathbb{R},{{x}^{2}}-\text{ }x+7\ge 0''\]. Đáp án là: D. \[\overline{A}:''\exists \,x\in \mathbb{R},{{x}^{2}}-\text{ }x+7\ge 0''\] </s> | [
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<s> Chọn đáp án đúng với câu hỏi: #2H3Y1-3~Trong không gian với hệ trục tọa độ Oxyz, cho mặt cầu (S): (x+1)2+(y-2)2+(z-1)2=9. Tìm tọa độ tâm I và tính bán kính R của mặt cầu (S).
A. I(-1;2;1) và R=3
B. I(-1;2;1) và R=9
C. I(1;-2;-1) và R=3
D. I(1;-2;-1) và R=9. Đáp án là: A. I(-1;2;1) và R=3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ngày 18/6/1919 Nguyễn Ái Quốc thay mặt những người Việt Nam yêu nước gửi Bản yêu sách của nhân dân An Nam tới đâu?
A. Nước Pháp.
B. Hội nghị Paris.
C. Hội nghị Ianta.
D. Hội nghị vécxai. Đáp án là: D. Hội nghị vécxai </s> | [
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<s> Chọn đáp án đúng với câu hỏi: There are a lot of _________ at tourist attractions in Ho Chi Minh city.
A. sighting
B. sightseeing
C. sightseers
D. sightseer Đáp án là: C. sightseers </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Este etyl fomat có công thức là
A. HCOOCH 3.
B. HCOOC 2 H 5.
C. CH 3 COOCH 3.
D. HCOOCH=CH 2. Đáp án là: B. HCOOC 2 H 5. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nội dung nào sau đây không phản ánh đúng về các tổ chức độc quyền ở các nước tư bản vào cuối thế kỉ XIX - đầu thế kỉ XX?
A. Đánh dấu chủ nghĩa tư bản chuyển từ giai đoạn độc quyền sang tự do cạnh tranh.
B. Là sự liên minh giữa các nhà tư bản lớn để tập trung sản xuất hoặc tiêu thụ hàng hóa.
C. Tồn tại dưới nhiều hình thức khác nhau, như: các-ten, xanh-đi-ca, tơ-rớt,...
D. Tạo cơ sở cho bước chuyển của chủ nghĩa tư bản từ tự do cạnh tranh sang độc quyền. Đáp án là: C. Tồn tại dưới nhiều hình thức khác nhau, như: các-ten, xanh-đi-ca, tơ-rớt,... </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ý nghĩa nội dung bài thơ sông Đáy là:
A. Là dòng sông Đáy gắn với những hoài niệm của nhà thơ
B. Là tình yêu quê hương, tình mẫu tử, là tình yêu đôi lứa, nỗi nhớ khắc khoải suốt cuộc đời của nhà thơ qua hình tượng sông Đáy
C. A và B đúng
D. A và B sao Đáp án là: C. A và B đúng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong một quá trình nung nóng đẳng áp ở áp suất 1,5.10 5 Pa, một chất khí tăng thể tích từ 40 d m 3 đến 60 d m 3 và tăng nội năng một lượng là 4,28 J. Nhiệt lượng truyền cho chất khí là
A. 1280 J
B. 3004,28 J
C. 7280 J
D. – 1280 J Đáp án là: B. 3004,28 J </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tìm số phát biểu đúng: (1) Loài muỗi được tạo ra nhờ đột biến đảo đoạn (2) Chuyển đoạn nhiễm sắc thể số 21 sang nhiễm sắc thể số 9 gây bệnh Ung thư máu ác tính (3) Lặp đoạn làm cho các gen alen trên cùng một NST (4) Đột biến mất đoạn làm mất cân bằng trong hệ gen (5) Đảo đoạn giữ vững mức độ hoạt động của gen
A. 5
B. 2
C. 4
D. 3 Đáp án là: D. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hãy chỉ ra vật nào dưới đây không phải là nguồn sáng?
A. Ngọn nến đang cháy
B. Vỏ chai sáng chói dưới trời nắng
C. Mặt trời
D. Đèn ống đang sáng Đáp án là: B. Vỏ chai sáng chói dưới trời nắng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong không gian với hệ toạ độ Oxyz, cho các điểm A(1,0,0), B(0,1,0). Mặt phẳng x+ay+bz+c=0 đi qua các điểm A,B đồng thời cắt tia Oz tại C sao cho tứ diện OABC có thể tích bằng 1/6. Giá trị của a+3b−2c là
A. 16.
B. 1.
C. 10.
D. 6. Đáp án là: D. 6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi thay nguyên tử H trong phân tử NH 3 bằng gốc hiđrocacbon thu được:
A. aminoaxit.
B. lipit.
C. amin.
D. este. Đáp án là: C. amin. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chất nào sau đây có khả năng làm quỳ tím ẩm hóa xanh?
A. Alanin
B. Anilin
C. Metylamin
D. Glyxin Đáp án là: C. Metylamin </s> | [
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<s> Chọn đáp án đúng với câu hỏi: (ĐỀ SỐ 14 Megabook năm 2018) Tiến hành các thí nghiệm sau: (a) Cho Mg vào dung dịch Fe 2 (SO 4 ) 3 dư. (b) Dẫn khí H 2 (dư) qua bột MgO nung nóng. (c) Cho dung dịch AgNO 3 tác dụng với dung dịch Fe(NO 3 ) 2 dư. (d) Cho Na vào dung dịch MgSO 4. (e) Đốt FeS 2 trong không khí. (f) Điện phân dung dịch Cu(NO 3 ) 2 với các điện cực trơ Số thí nghiệm không tạo thành kim loại là
A. 4
B. 2
C. 5
D. 3 Đáp án là: A. 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một dung dịch A chứa 0,01 mol K +, 0,02 mol HCO 3 -, 0,02 mol Mg 2+ và x mol SO 4 2-. Khối lượng muối khan thu được khi cô cạn dung dịch là
A. 3,53 gam.
B. 3,51 gam.
C. 2,91 gam.
D. 2,07 gam. Đáp án là: C. 2,91 gam. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Có mấy dạng năng lượng:
A. 2
B. 4
C. 6
D. 8 Đáp án là: C. 6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: What decision was changed?
A. Which trees should be dug up
B. When the old trees should be cut down
C. Where the new trees should be planted
D. Which type of tree should be chosen Đáp án là: C. Where the new trees should be planted </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thổi khí NH 3 (dư) qua 10 gam CrO 3 đốt nóng đến phản ứng hoàn toàn thì thu được chất rắn màu lục có khối lượng là:
A. 0,52 gam.
B. 0,68 gam.
C. 7,6 gam.
D. 1,52 gam. Đáp án là: B. 0,68 gam. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hỗn hợp các ankan sau : pentan (sôi ở 36 o C), heptan (sôi ở 98 o C), octan (sôi ở 126 o C), nonan (sôi ở 151 o C). Có thể tách riêng các chất đó bằng cách nào sau đây
A. Kết tinh
B. Chưng cất
C. Thăng hoa
D. Chiết Đáp án là: B. Chưng cất </s> | [
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1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Khi nói về s ự phân t ầng trong qu ần xã, có bao nhiêu phát biểu nào sau đây đúng? I. Hệ sinh thái nhân tạo thường có tính phân tầng m ạnh m ẽ h ơn so v ới h ệ sinh thái tự nhiên. II. Sự phân t ầng s ẽ góp ph ần làm gi ảm c ạnh tranh cùng loài nh ưng th ư ờng d ẫn t ới làm t ăng c ạnh tranh khác loài. III. Nguyên nhân d ẫn t ới s ự phân tầng c ủa qu ần xã là do s ự phân b ố không đ ều c ủa nhân tố sinh thái và do s ự thích nghi c ủa các loài sinh v ật. IV. Sự phân t ầng làm phân hóa ổ sinh thái c ủa các loài.
A. 1
B. 3
C. 4
D. 2 Đáp án là: D. 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một đội công nhân tham gia sửa một đoạn đường. Ngày thứ nhất đội công nhân sửa được 392 mét đường. Do đẩy nhanh tiến độ nên ngày thứ hai đội đó sửa được 413 mét đường. Hỏi cả hai ngày đội công nhân sửa được bao nhiêu mét đường?
A. 805m
B. 704m
C. 815m
D. 714m Đáp án là: A. 805m </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ha-oai là hòn đảo nằm giữa đại dương nào dưới đây?
A. Thái Bình Dương.
B. Ấn Độ Dương.
C. Bắc Băng Dương.
D. Đại Tây Dương. Đáp án là: A. Thái Bình Dương. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho tam giác ABC vuông tại A, ACB^=30°, cạnh AB=5cm. Độ dài cạnh AC là:
A. 10 cm
B. (5√(3))/2 cm.
C. 5√(3) cm
D. 5/(√(3)) cm. Đáp án là: C. 5√(3) cm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong mặt phẳng Oxy cho v→=(3;1) và M= (1;2). Tìm ảnh của điểm M qua phép tịnh tiến theo vectơ v→.
A. (-4;3)
B. (4;3)
C. (-2;1)
D. (2;-1) Đáp án là: B. (4;3) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hai nguồn kết hợp A và B dao động cùng tần số ƒ = 30 Hz, cùng biên độ a = 2 cm nhưng ngược pha nhau. Coi biên độ sóng không đổi, tốc độ truyền sóng v = 90 cm/s. Biên độ dao động tổng hợp tại điểm M cách A, B một đoạn AM = 15 cm, BM = 13 cm bằng
A. 2 cm.
B. 2 3 (cm).
C. 4 cm.
D. 0 cm. Đáp án là: A. 2 cm. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nội dung nào dưới đây không phản ánh đúng đặc điểm của bầy người nguyên thủy?
A. Có người đứng đầu mỗi bầy người.
B. Có phân công lao động giữa nam và nữ.
C. Sống quây quần theo quan hệ ruột thịt.
D. Có sự phân hóa giàu nghèo. Đáp án là: D. Có sự phân hóa giàu nghèo </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một vật được thả rơi từ độ cao h = 10 m so với mặt đất. Tại thời điểm vật có động năng bằng 3 lần thế năng thì nó đang ở độ cao bằng bao nhiêu? Chọn mốc thế năng tại mặt đất.
A. 2,5 m.
B. 10 m.
C. 0 m.
D. 5 m. Đáp án là: A. 2,5 m. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Lựa chọn đáp án đúng nhất:Hai mảnh vườn trồng tỏi có diện tích bằng nhau, và mỗi mảnh đều thu hoạch được 240 kg tỏi khô. Người ta chia các củ tỏi khô thành từng túi 3kg để bán. Hỏi tất cả số tỏi đó chia được bao nhiêu túi như nhau?
A. 360 túi
B. 306 túi
C. 160 túi
D. 40 túi Đáp án là: C. 160 túi </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Sông Mê Công chảy qua bao nhiêu quốc gia?
A. 5.
B. 6.
C. 7.
D. 8. Đáp án là: B. 6. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ông để lại các công trình biên soạn về lĩnh vực nào?
A.Văn học
B.Triết học
C.Lịch sử
D.Tất cả các phương án trên Đáp án là: D.Tất cả các phương án trên </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Lựa chọn đáp án đúng nhất:Tìm y, biết:579,21 + y = 875,76
A. y = 296,54
B. y = 296,55
C. y = 297,54
D. y = 297,55 Đáp án là: B. y = 296,55 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở điều kiện thường, khả năng hoạt động hóa học của P như thế nào so với N 2
A. P yếu hơn
B. P mạnh hơn
C. Bằng nhau
D. Không xác định Đáp án là: B. P mạnh hơn </s> | [
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1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Cảm xúc bao trùm lên tác phẩm Tiếng gà trưa là tình yêu gia đình
A. Mùi cơm
B. Tiếng gà
C. Hương khói bếp
D. Cả 3 đáp án trên Đáp án là: B. Tiếng gà </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Theo thống kê năm 2005, tỉ trọng của trồng trọt trong cơ cấu giá trị sản xuất nông nghiệp là (%)
A. 73,5
B. 73,4
C. 73,3
D. 73,2 Đáp án là: A. 73,5 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một nguồn sáng chỉ phát ra ánh sáng đơn sắc có tần số 5.10 14 Hz. Công suất bức xạ điện từ của nguồn là 10 W. Số phôtôn mà nguồn phát ra trong một giây xấp xỉ bằng
A.
B.
C.
D. Đáp án là: A. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Điểm nào sau đây không đúng với thiên nhiên vùng biển và thềm lục địa nước ta.
A. Vùng biển lớn gấp 3 lần diện tích đất liền.
B. Thềm lục địa phía bắc và phía nam có đáy nông mở rộng.
C. Đường bờ biển Nam Trung Bộ bằng phẳng.
D. Thềm lục địa miền trung thu hẹp tiếp giáp với vùng biển nước sâu. Đáp án là: D. Thềm lục địa miền trung thu hẹp tiếp giáp với vùng biển nước sâu </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong một hộp có 2 quả bóng trắng, 2 quả bóng đỏ, 3 quả bóng xanh có kích thước khác nhau. Nam lấy ra đồng thời 3 bóng từ hộp, hỏi có bao nhiêu kết quả thuận lợi cho biến cố A: “Bóng lấy ra có ít nhất một quả màu xanh” và đây là biến cố gì?
A. 7 và là biến cố ngẫu nhiên;
B. 0 và là biến cố không thể;
C. 5 và là biến cố chắc chắn;
D. 6 và là biến cố ngẫu nhiên. Đáp án là: D. 6 và là biến cố ngẫu nhiên </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hàm số y=√(3)sinx+cosx−2x+2019. Số nghiệm của phương trình y^'=0 trên đoạn (0;2020π) là
A. 2019.
B. 2020.
C. 1011.
D. 1010. Đáp án là: D. 1010 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: X, Y, Z là ba axit cacboxylic đơn chức cùng dãy đồng đẳng (M X < M Y < M Z ), T là este tạo bởi X, Y, Z với một ancol no, ba chức, mạch hở E. Đốt cháy hoàn toàn 26,6 gam hỗn hợp M gồm X, Y, Z, T (trong đó Y và Z có cùng số mol) bằng lượng vừa đủ khí O 2, thu được 22,4 lít CO 2 (đktc) và 16,2 gam H 2 O. Nếu đun nóng 26,6 gam M với lượng dư dung dịch AgNO 3 /NH 3, sau khi các phản ứng xảy ra hoàn toàn thu được 21,6 gam Ag. Mặt khác, nếu cho 13,3 gam M phản ứng hết với 400 ml dung dịch NaOH 1M và đun nóng thu được dịch N. Cô cạn dung dịch N thu được m gam chất rắn khan. Giá trị của m g ầ n nh ấ t với
A. 38,04
B. 24,74
C. 16,74
D. 25,10 Đáp án là: B. 24,74 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: ở người bệnh máu khó đông do đột biến gen lặn a trên nhiễm sắc thể giới tính X quy định. Bố mẹ có kiểu gen nào để sinh con gái mắc bệnh với tỉ lệ 25%?
A. X a X a × X a Y
B. X A X a × X A Y
C. X A X A × X a Y
D. X A X a × X a Y Đáp án là: D. X A X a × X a Y </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khoảng năm 1000, vua Vi-gya-a Sơ-ri rời kinh đô về
A. In-đờ-ra-pu-ra.
B. Sin-ha-pu-ra.
C. Vi-ra-pu-ra.
D.Vi-giay-a. Đáp án là: D.Vi-giay-a </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nhiệt độ trung bình năm của nước ta có xu hướng biến động mạnh do tác động của
A. biến đổi khí hậu.
B. nước biển dâng.
C. thời tiết cực đoan.
D. thủng tầng ô-dôn. Đáp án là: A. biến đổi khí hậu. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Văn bản Trò chơi cướp cờ thuộc thể loại gì?
A. Văn bản nghị luận
B. Văn bản thông tin
C. Văn bản nhật dụng
D. Ngụ ngôn Đáp án là: B. Văn bản thông tin </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Câu nào sai? Cung cấp nhiệt cho một khối chất lỏng thì:
A. thể tích của khối chất đó tăng
B. nhiệt độ của khối chất đó tăng
C. suất căng bề mặt giảm
D. thời gian cư trú của phân tử chất lỏng tăng Đáp án là: D. thời gian cư trú của phân tử chất lỏng tăng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khu vực nào sau đây của nước ta có tình trạng hạn hán kéo dài 6 -7 tháng?
A. Ven biển Bắc Trung Bộ.
B. Ven biển cực Nam Trung Bộ.
C. Ven biển đồng bằng sông Cửu Long.
D. Ven biển vùng Đông Nam Bộ. Đáp án là: B. Ven biển cực Nam Trung Bộ. </s> | [
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
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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,
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: Thực hiện phép tính 6^2: 4.3 + 2.5^2 rồi phân tích kết quả ra thừa số nguyên tố
A. 55 = 5.11;
B. 66 = 6.11;
C. 77 = 7.11;
D. 44 = 4.11. Đáp án là: C. 77 = 7.11; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hương hái được 8 bông hoa, Thu hái được nhiều hơn Hương 4 bông hoa. Hỏi cả hai bạn hái được bao nhiêu bông hoa?
A. 12 bông hoa
B. 20 bông hoa
C. 25 bông hoa
D. 28 bông hoa Đáp án là: B. 20 bông hoa </s> | [
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<s> Chọn đáp án đúng với câu hỏi: They had decorated the tree with colored balls.
A. Colored balls had been decorated under the tree.
B. The tree had been decorated with colored balls.
C. They had decorated colored balls and the tree.
D. With colored balls the tree had looked beautiful. Đáp án là: B. The tree had been decorated with colored balls. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: (megabook năm 2018) Cho mạch điện gồm ba phần tử: cuộn thuần cảm, điện trở thuần R, tụ điện C mắc nối tiếp nhau. M và N là các điểm giữa ứng với cuộn dây và điện trở, điện trở và tụ. Điện áp hai đầu đoạn mạch AB có tần số 50 Hz. Điện trở và độ tự cảm không đổi nhưng tụ có điện dung biến thiên. Người ta thấy khi C = C x thì điện áp hiệu dụng hai đầu M, B đạt cực đại bằng hai lần hiệu điện thế hiệu dụng U của nguồn. Tỉ số giữa cảm kháng và dung kháng khi đó là:
A. 4 3
B. 2
C. 3 4
D. 1 2 Đáp án là: C. 3 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Do tác động của gió mà Đông Bắc nên nửa đầu mùa đông ở miền Bắc nước ta thường có kiểu thời tiết
A. ấm áp, khô ráo.
B. lạnh, khô.
C. ấm áp, ẩm ướt.
D. lạnh, ẩm. Đáp án là: B. lạnh, khô. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho biết tên của công thức cấu tạo sau: C H 3 - C H C H 3 2 - C H 2 - C H 3
A. pentan
B. 2 – metylbutan
C. isobutan
D. 2, 2 – đimetylbutan Đáp án là: D. 2, 2 – đimetylbutan </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chỉ thị “ Nhật – Pháp bắn nhau và hành động của chúng ta ” (12 – 3- 1945) đã đề ra chủ trương nào?
A. Kêu gọi sửa soạn khởi nghĩa.
B. Lời kêu đứng dậy khởi nghĩa.
C. Khởi nghĩa giành chính quyền.
D. Phát động cao trào “Kháng Nhật cứu nước”. Đáp án là: D. Phát động cao trào “Kháng Nhật cứu nước” </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phần thân bài nên trình bày như thế nào để rõ ràng, mạch lạc?
A. Trình bày bằng nhiều đoạn văn nhỏ giải quyết các khía cạnh của chủ đề
B. Nội dung được trình bày tùy thuộc kiểu văn bản, chủ đề, ý đồ giao tiếp của người viết
C. Trình bày thành một đoạn văn duy nhất
D. A và B đúng Đáp án là: D. A và B đúng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: A. collect B. concept C. conceal D. consume
A. collect
B. concept
C. conceal
D. consume Đáp án là: B. concept </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Xác định cảm ứng từ tại tâm vòng tròn. Biết một sợi dây rất dài căng - thẳng. Ở khoảng giữa được uốn thành vòng tròn như hình. Bán kính vòng tròn R = 6 c m, cường độ dòng điện chạy qua dây dẫn I = 3, 75 A.
A. 3, 93.10 - 6 T
B. 4, 12.10 - 6 T
C. 2, 68.10 - 5 T
D. 5, 18.10 - 5 T Đáp án là: B. 4, 12.10 - 6 T </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The ______ target of policy in Canada is the achievement and maintenance of price stability.
A. final
B. eventual
C. ultimate
D. last Đáp án là: C. ultimate </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tập nghiệm của bất phương trình (1/3)^x≤x+4 là
A. (−∞;−1).
B. (−1;+∞).
C. (1;+∞).
D. (−∞;1). Đáp án là: B. (−1;+∞). </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nung 19,4 gam hỗn hợp Fe(NO 3 ) 2 và AgNO 3 một thời gian thu được hỗn hợp chất rắn X. Cho X vào được đến khi các phản ứng xảy ra hoàn toàn thu được chất rắn Y và dung dịch Z. Cho Y vào dung dịch HCl dư có 4,32 gam chất rắn không tan. Cho Z tác dụng với dung dịch HCl dư thì có khí không màu thoát ra hóa nâu trong không khí. Phần trăm khối lượng của AgNO 3 trong hỗn hợp ban đầu là:
A. 30,94
B. 35,05
C. 22,06
D. 30,67 Đáp án là: B. 35,05 </s> | [
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31500,
3047... | [
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<s> Chọn đáp án đúng với câu hỏi: Ở điều kiện thường, những kim loại phản ứng được với nước là
A. Mg, Sr, Ba
B. Sr, Ca, Ba
C. Ba, Mg, Ca
D. Ca, Be, Sr Đáp án là: B. Sr, Ca, Ba </s> | [
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<s> Chọn đáp án đúng với câu hỏi: He told me _______ at the scene of the accident.
A. what had he seen
B. what he had seen
C. that what he had seen
D. whether what had he seen Đáp án là: B. what he had seen </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một đơn vị chức năng thận không bao gồm thành phần nào dưới đây?
A. Ống dẫn nước tiểu
B. Ống thận
C. Cầu thận
D. Nang cầu thận Đáp án là: A. Ống dẫn nước tiểu </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Giá trị của chữ số 6 trong số 386572
A. 6
B. 60
C. 600
D. 6000 Đáp án là: D. 6000 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Theo anh (chị), Việt Nam hóa chiến tranh có phải là sự trở lại với hình thức tăng cường của chiến tranh đặc biệt không? Vì sao?
A. Không. Vì đây là một bước leo thang mới của Mĩ sau chiến tranh cục bộ
B. Có. Vì quân đội Sài Gòn và quân đồng minh tiếp tục được sử dụng
C. Không. Vì quy mô chiến tranh được mở rộng ra toàn Đông Dương
D. Có. Vì nó giống nhau ở bản chất nhưng được nâng lên ở quy mô, mức độ ác liệt hơn Đáp án là: D. Có </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Than đá của LB Nga có trữ lượng đứng thứ mấy trên thế giới (năm 2004)?
A. Thứ nhất.
B. Thứ hai.
C. Thứ ba.
D. Thứ tư. Đáp án là: C. Thứ ba. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nguyên nhân khiến vùng hạ lưu sông Hồng ở Việt Nam có lũ lớn vào thời kì cuối hạ là do
A. mưa lớn tập trung vào mùa hạ.
B. nước từ thượng nguồn đổ dồn về hạ lưu.
C. băng tuyết trên đỉnh Phan-xi-păng tan chảy xuống.
D. đập thủy điện Hòa Bình xả nước gây lũ. Đáp án là: A. mưa lớn tập trung vào mùa hạ. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thành ngữ nào dưới đây phản ánh đúng nhất tình trạng đời sống của Người tối cổ?
A. Ăn lông ở lỗ.
B. Ăn sống nuốt tươi.
C. Nay đây mai đó.
D. Man di mọi dợ. Đáp án là: A. Ăn lông ở lỗ. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các oxit sau: CrO 3, Mn 2 O 7, Fe 2 O 3, CuO, SO 3, P 2 O 5, CO, NO, CO 2, SO 2. Số oxit tác dụng với nước tạo thành axit tương ứng là:
A. 4.
B. 5.
C. 6.
D. 7. Đáp án là: C. 6. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi sử dụng tình thái từ, cần chú ý điều gì?
A. Tính địa phương
B. Phù hợp với hoàn cảnh giao tiếp
C. Không được sử dụng biệt ngữ
D. Phải có sự kết hợp với các trợ từ Đáp án là: B. Phù hợp với hoàn cảnh giao tiếp </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các phản ứng sau: 4HCl + M n O 2 → M n C l 2 + C l 2 + 2 H 2 O 2HCl + C a O C l 2 → C a C l 2 + C l 2 + H 2 O 3HCl + F e O H 3 → F e C l 3 + 3 H 2 O 6HCl + 2Al → 2 A l C l 3 + 3 H 2 16HCl + 2 K M n O 4 → 2KCl + 2 M n C l 2 + 5 C l 2 + 8 H 2 O Trong các phản ứng trên, số phản ứng trong đó HCl thể hiện tính khử là
A. 2
B. 1
C. 4
D. 3 Đáp án là: D. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Lang Lieu couldn't buy any special food __________ he was very poor.
A. although
B. when
C. while
D. because Đáp án là: B. when </s> | [
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<s> Chọn đáp án đúng với câu hỏi: In the second paragraph, the pronoun "them" refers to which of the following?
A. Pilgrims
B. the Mayflowers
C. Native Americans
D. Schools Đáp án là: A. Pilgrims </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Trong không gian Oxyz, mặt phẳng (P): 2x + y - 3z + 4 = 0 có một vectơ pháp tuyến là
A. n_4→=(2; −3; 4);
B. n_3→=(2; 1; 3);
C. n_1→=(2; 0; −3);
D. n_2→=(2; 1; −3). Đáp án là: D. n_2→=(2; 1; −3) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kết quả của phép tính 1245 + 7011 là
A. 8625
B. 8526
C. 8255
D. 8256 Đáp án là: D. 8256 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: High-powered cars are _______ weapons in the hands of inexperienced drivers.
A. terminal
B. immortal
C. lethal
D. fatal Đáp án là: B. immortal </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các dung dịch sau: Ba(HCO 3 ) 2, NaOH, AlCl 3, KHSO 4 được đánh số ngẫu nhiên là X, Y, Z, T. Tiến hành các thí nghiệm sau: Hoá chất X Y Z T Quỳ tím Xanh Đỏ Xanh Đỏ Dung dịch HCl Khí bay ra Đồng nhất Đồng nhất Đồng nhất Dung dịch Ba(OH) 2 Kết tủa trắng Kết tủa trắng Đồng nhất Kết tủa trắng, sau tan Dung dịch chất Y là
A. KHSO 4
B. NaOH
C. AlCl 3
D. Ba(HCO 3 ) 2 Đáp án là: A. KHSO 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số lớn nhất trong các số: 6,235; 5,325; 6,325; 4,235 là:
A.6,235
B.5,325
C.6,325
D.4,235 Đáp án là: C.6,325 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: With greatly increased workloads, everyone is ______ pressure now
A. out of
B. above
C. under
D. upon Đáp án là: C. under </s> | [
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<s> Chọn đáp án đúng với câu hỏi: How much main religions exist in the ASEAN countries?
A. how much
B. religions
C. exist
D. countries Đáp án là: A. how much </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một cặp nhiệt điện đồng-constantan có hệ số nhiệt điện động là 42,5μV/K được nối với một milivon kế thành một mạch kín. Một mối hàn của cặp nhiệt điện được giũ trong không khí ở 25 o C, mối hàn còn lại được nhúng vào khối thiếc đang nóng chảy. Khi đó milivon kế chỉ 9 mV. Nhiệt độ nóng chảy của thiếc là
A. 509 o C
B. 512 0 C
C. 885 o C
D. 300 o C Đáp án là: A. 509 o C </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dung dịch X có màu da cam. Nếu cho thêm vào một lượng KOH, màu đỏ của dung dịch dần dần chuyển sang màu vàng tươi. Nếu thêm vào đó một lượng H 2 SO 4, màu của dung dịch dần dần trở lại màu da cam. Dung dịch X chứa chất có công thức phân tử là
A. K 2 Cr 2 O 7
B. K 2 CrO 4.
C. KCr 2 O 4.
D. H 2 CrO 4. Đáp án là: A. K 2 Cr 2 O 7 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The whole world knows that summer will not (34) ________ forever.
A. forego
B. evaluate
C. succumb
D. last Đáp án là: D. last </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho biểu đồ: Căn cứ vào biểu đồ hãy cho biết nhận xét nào sau đây đúng về chế độ nước sông Hồng và sông Đà Rằng?
A. Có một mùa lũ và một mùa cạn, mùa lũ trên sông Hồng vào mùa hạ, mùa lũ trên sông Đà Rằng vào thu - đông.
B. Sông nhiều nước quanh năm, đặc biệt vào vào mùa hạ, sông Đà Rằng có lũ tiểu mãn vào tháng VI.
C. Có một mùa lũ và một mùa cạn, mùa lũ trên cả hai sông đều diễn ra vào mùa hạ.
D. Sông nhiều nước quanh năm, mùa lũ trên sông Hồng vào thu - đông, mùa lũ trên sông Đà Rằng vào mùa hạ. Đáp án là: A. Có một mùa lũ và một mùa cạn, mùa lũ trên sông Hồng vào mùa hạ, mùa lũ trên sông Đà Rằng vào thu - đông. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Các chất bảo vệ thực vật và các chất độc hoá học thường được tích tụ ở đâu?
A. Đất, nước
B. Nước, không khí
C. Không khí, đất
D. Đất, nước, không khí, và trong cỏ thể sinh vật Đáp án là: D. Đất, nước, không khí, và trong cỏ thể sinh vật </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Not _______ teenagers spend _______ time on reading books.
A. much / many
B. many / much
C. much / much
D. many / many Đáp án là: B. many / much </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trên bản đồ tỉ lệ 1:300 000, 3 cm trên bản đồ ứng với bao nhiêu km ngoài thực địa?
A. 9km.
B. 900km.
C. 0,9km.
D. 90km. Đáp án là: A. 9km. </s> | [
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678,
30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
30057,
29884,
298,
228,
190,
146,
29875,
29901,
6479,
31500,
29876,
9922,
207,
140,
29876,
29871,
30128,
29877,
31500... | [
1,
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1... |
<s> Chọn đáp án đúng với câu hỏi: Current extinction rates are at least 100 to 1,000 times higher than____ rates found in the fossil record.
A. nature
B. natural
C. naturally
D. naturalness Đáp án là: B. natural </s> | [
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1,
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1,
1... |
<s> Chọn đáp án đúng với câu hỏi: The word "cost-prohibitive" in the passage is closest in meaning to ____.
A. cheap
B. expensive
C. bargain
D. sale Đáp án là: B. expensive </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về thuyết lượng tử ánh sáng, phát biểu nào sau đây là đúng?
A. Ánh sáng được tạo bởi các hạt gọi là phôtôn.
B. Phôtôn có thể chuyển động hay đứng yên tùy thuộc vào nguồn sáng chuyển động hay đứng yên.
C. Năng lượng phôtôn càng nhỏ khi cường độ chùm ánh sáng càng nhỏ.
D. Năng lượng của phôtôn càng lớn khi tần số của ánh sáng ứng với phôtôn đó càng nhỏ. Đáp án là: A. Ánh sáng được tạo bởi các hạt gọi là phôtôn. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Phản ứng phân hạch và phản ứng nhiệt hạch giống nhau ở điểm nào sau đây?
A. Xảy ra ở hạt nhân có số khối lớn.
B. Là phản ứng có thể điều khiển được.
C. Xảy ra ở nhiệt độ rất cao.
D. Là phản ứng hạt nhân tỏa năng lượng. Đáp án là: D. Là phản ứng hạt nhân tỏa năng lượng </s> | [
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1,
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: After a serious ankle injury, it took him 3 months to build up his _______ again.
A. strong
B. strongly
C. strengthen
D. strength Đáp án là: D. strength </s> | [
1,
1,
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678,
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<s> Chọn đáp án đúng với câu hỏi: Hiện tượng xảy ra khi cho dung dịch H 2 S O 4 vào dung dịch N a 2 C r O 4 là:
A. Dung dịch chuyển từ màu vàng thành không màu
B. Dung dịch chuyển từ màu da cam sang màu vàng
C. Dung dịch chuyển từ màu vàng sang màu da cam
D. Dung dịch chuyển từ không màu sang màu da cam Đáp án là: C. Dung dịch chuyển từ màu vàng sang màu da cam </s> | [
1,
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1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Một bóng đèn dây tóc có ghi 24V-2,4W. Trả lời các câu hỏi sau. Cường độ dòng điện qua bóng đèn khi đèn sáng bình thường có giá trị bằng bao nhiêu?
A. 1A
B. 0,1A
C. 2,4A
D. 10A Đáp án là: B. 0,1A </s> | [
1,
1,
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678,
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29976,
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865,
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1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Sau khi thôn tính toàn bộ Tiệp Khắc, Hít-le đã
A. chấm dứt mọi cuộc thôn tính ở châu Âu
B. tiến hành đàm phán với Liên Xô để chống lại Anh và Pháp
C. đề nghị đàm phán với Anh, Pháp để chống lại Liên Xô
D. gây hấn và ráo riết chuẩn bị tiến hành chiến tranh với Ba Lan Đáp án là: D. gây hấn và ráo riết chuẩn bị tiến hành chiến tranh với Ba Lan </s> | [
1,
1,
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29901,
23863,
413,
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266,
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31500,
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