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<s> Chọn đáp án đúng với câu hỏi: She ______ her voice, turned back to Alex, and put a hand on his shoulder.
A. lowered
B. decreased
C. depleted
D. lessened Đáp án là: A. lowered </s> | [
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<s> Chọn đáp án đúng với câu hỏi: _____me and I'll explain the homework to you.
A. Call
B. If you call
C. Calling
D. To call Đáp án là: A. Call </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cation R + có cấu hình electron phân lớp ngoài cùng là 3p 6. Vị trí của R trong bảng tuần hoàn là
A. Ô thứ 20, nhóm IIA, chu kỳ 4
B. Ô thứ 19, nhóm IB, chu kỳ 4
C. Ô thứ 19, nhóm IA, chu kỳ 4
D. Ô thứ 17, nhóm VIIA, chu kỳ 3 Đáp án là: C. Ô thứ 19, nhóm IA, chu kỳ 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Từ metan điều chế vinyl axetat ít nhất phải qua bao nhiêu phản ứng?
A. 2
B. 3
C. 4
D. 5 Đáp án là: C. 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số cực trị của hàm số f(x)=(x+1)/(x−1) là
A. 1
B. 3
C. 2
D. 0 Đáp án là: D. 0 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Từ giữa những năm 70 của thế kỉ XX, Ấn Độ đã tự túc được lương thực là nhờ tiến hành cuộc cách mạng nào dưới đây?
A. Cách mạng công nghiệp.
B. Cách mạng chất xám.
C. Cách mạng công nghệ.
D. Cách mạng xanh. Đáp án là: D. Cách mạng xanh </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phân bón nào dưới đây có hàm lượng N cao nhất?
A. NH 4 Cl
B. NH 4 NO 3
C. Ca(NO 3 ) 2
D. (NH 2 ) 2 CO Đáp án là: D. (NH 2 ) 2 CO </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đọc hai câu thơ sau đây : “Nắng rọi Hương Lô khói tía bay Xa trông dòng thác trước sông này” Hãy xác định từ đồng nghĩa với từ "trông" ở câu thơ thứ hai.
A. Mong
B. Nhìn
C. Đợi
D. Chờ Đáp án là: B. Nhìn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hỗn hợp X gồm hai peptit mạch hở có cùng số nguyên tử cacbon và một este no, đơn chức, mạch hở được tạo bởi axit cacboxylic và ancol. Đun nóng 29,34 gam X với dung dịch NaOH vừa đủ, thu được ancol etylic và hỗn hợp Y gồm ba muối (trong đó có hai muối của hai α-amino axit có dạng H 2 N-C n H 2n -COOH). Đốt cháy toàn bộ Y cần dùng 0,93 mol O 2, thu được CO 2 ; H 2 O; 0,12 mol N 2 và 0,195 mol Na 2 CO 3. Phần trăm số mol của peptit có khối lượng phân tử lớn trong hỗn hợp X là
A. 16,67%.
B. 20,83%.
C. 25,00%.
D. 33,33%. Đáp án là: C. 25,00%. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cư dân đầu tiên của quốc gia Ô-xtray-li-a có nguồn gốc:
A. Người châu Á
B. Người châu Âu
C. Người dân bản địa
D. Người Hà Lan Đáp án là: C. Người dân bản địa </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một vật dao động điều hòa dọc theo một đường thẳng. Một điểm M nằm cố định trên đường thẳng đó, phía ngoài khoảng chuyển động của vật. Tại thời điểm t thì vật xa M nhất, sau đó một khoảng thời gian ngắn nhất ∆ t là vật gần M nhất. Độ lớn vận tốc của vật bằng nửa tốc độ cực đại vào thời điểm gần nhất là:
A. t + Δt 6
B. t + 2 Δt 3
C. t + Δt 4
D. t + Δt 3 Đáp án là: A. t + Δt 6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho 2,96 gam este đơn chức X phản ứng vừa hết với 20 ml dung dịch NaOH 2M thu được 2 chất Z và T. Đốt cháy m gam T thu được 0,44 gam CO 2 và 0,36 gam H 2 O. Chất X là:
A. CH 3 COOCH 3.
B. HCOOC 2 H 5.
C. CH 3 COOC 2 H 5.
D. C 2 H 5 COOCH 3. Đáp án là: A. CH 3 COOCH 3. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the word whose underlined part is pronounced differently from that of the other words.
A. st a ge
B. p a ge
C. c a ke
D. t a blet Đáp án là: D. t a blet </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Qua một thấu kính, ảnh thật của một vật thật cao hơn vật 2 lần và cách vật 36 cm. Đây là thấu kính
A. hội tụ có tiêu cự 8 cm
B. hội tụ có tiêu cự 24 cm
C. phân kì có tiêu cự 8 cm
D. phân kì có tiêu cự 24 cm Đáp án là: A. hội tụ có tiêu cự 8 cm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hệ thức nào sau đây không phù hợp với định luật Bôilơ− Mariot?
A. p 1 V 1 = p 2 V 2
B. p ~ V
C. v ~ 1 p
D. p ~ 1 v Đáp án là: B. p ~ V </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho sơ đồ phản ứng : (a) X + H 2 O → xúc tác Y (b) Y + AgNO 3 + NH 3 + H 2 O ® amoni gluconat + Ag + NH 4 NO 3 (c) Y → xúc tác E + Z (d) Z + H 2 O → chất diệp lục ánh sáng X + G X, Y, Z lần lượt là :
A. Tinh bột, glucozơ, cacbon đioxit
B. Tinh bột, glucozơ, etanol
C. Xenlulozơ, saccarozơ, cacbon đioxit
D. Xenlulozơ, fructozơ, cacbon đioxit Đáp án là: A. Tinh bột, glucozơ, cacbon đioxit </s> | [
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<s> Chọn đáp án đúng với câu hỏi: They ______ be away for the weekend but I am not sure.
A. needn’t
B. should not
C. must
D. might Đáp án là: D. might </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the word that has the underlined part pronounced differently.
A. r e staurant
B. e raser
C. t e mple
D. t e levision Đáp án là: B. e raser </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phát biểu nào sau đây là không đúng?
A. Điện trường tĩnh là do các hạt mang điện đứng yên sinh ra.
B. Tính chất cơ bản của điện trường là nó tác dụng lực điện lên điện tích đặt trong nó.
C. Véctơ cường độ điện trường tại một điểm luôn cùng phương, cùng chiều với vectơ lực điện tác dụng lên một điện tích đặt tại điểm đó trong điện trường.
D. Véctơ cường độ điện trường tại một điểm luôn cùng phương, cùng chiều với vectơ lực điện tác dụng lên một điện tích dương đặt tại điểm đó trong điện trường. Đáp án là: C. Véctơ cường độ điện trường tại một điểm luôn cùng phương, cùng chiều với vectơ lực điện tác dụng lên một điện tích đặt tại điểm đó trong điện trường. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một lò xo có chiều dài tự nhiên 10cm và có độ cứng 40N/m. Giữ cố định một đầu và tác dụng vào đầu kia một lực 1N để nén lò xo. Chiều dài của lò xo khi bị nén là:
A. 5cm
B. 15cm
C. 10cm
D. 7,5cm Đáp án là: D. 7,5cm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Xét 2 cặp nhiễm sắc thể, trong đó trên cặp nhiễm sắc thể thứ nhất có 4 gen theo thứ tự là ABCD; trên nhiễm sắc thể số 2 có 3 gen theo thứ tự là EGH. Mỗi gen quy định một tính trạng, mỗi gen có 2 alen, alen trội là trội hoàn toàn. Theo lí thuyết, có bao nhiêu phát biểu sau đây đúng? I. Có tối đa 574 phép lai giữa cơ thể có kiểu hình trội về 7 tính trạng với cơ thể có kiểu hình lặn về 7 tính trạng. II. Cho 2 cơ thể có kiểu gen khác nhau lai với nhau, sẽ có tối đa 11982960 phép lai. III. Có tối đa 14 phép lai giữa cơ thể có kiểu hình trội về 1 tính trạng với cơ thể đồng hợp lặn. IV. Phép lai giữa 2 cơ thể đều có kiểu hình trội về 1 tính trạng sẽ cho đời con có tối đa 3 kiểu gen.
A. 1
B. 4
C. 3
D. 2 Đáp án là: C. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các loại phân sau, phân nào là phân bón kép?
A. CO(N H 2 ) 2
B. N H 4 N O 3
C. KN O 3
D. C a 3 P O 4 2 Đáp án là: C. KN O 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Viết tích sau dưới dạng lũy thừa: 6.6.6.6.6
A.6^6
B.6^5
C.5^6
D.6^4 Đáp án là: B.6^5 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: John told his brother “Report yourself to the police and you’ll get lighter penalty”.
A. John threatened his brother to report himself to the police.
B. John promised his brother a report of himself to the police.
C. John persuaded his brother to report himself to the police.
D. John asked his brother to give up himself to the police. Đáp án là: C. John persuaded his brother to report himself to the police. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một alen nào đó dù có lợi cũng có thể bị loại bỏ hoàn toàn khỏi quần thể là do tác động của nhân tố tiến hoá nào sau đây?
A. Giao phối không ngẫu nhiên
B. Chọn lọc tự nhiên
C. Các yếu tố ngẫu nhiên
D. Giao phối ngẫu nhiên Đáp án là: C. Các yếu tố ngẫu nhiên </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kính cận thích hợp là kính phân kì có tiêu điểm F
A. trùng với điểm cực cận của mắt
B. trùng với điểm cực viễn của mắt
C. nằm giữa điểm cực cận và điểm cực viễn của mắt
D. nằm giữa điểm cực cận và thể thủy tinh của mắt Đáp án là: B. trùng với điểm cực viễn của mắt </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,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: You ______ pay me back that money you owe me soon, or else!
A. had better
B. would
C. would prefer
D. should not Đáp án là: A. had better </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số dư của phép chia 123.12 + 15 cho 12 là:
A. 1;
B. 2;
C. 3;
D. 5. Đáp án là: C. 3; </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the option A, B, C, or D that best fits the sentence. Each child was asked in turn to ______ what he or she wanted from the situation.
A. notify
B. state
C. inform
D. announce Đáp án là: B. state </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho phương trình ion: FeS + H + +SO 4 2- → Fe 3+ + SO 2 + H 2 O. Tổng hệ số nguyên tối giản củaphương trình ion này là
A. 30.
B. 50.
C. 36.
D. 42. Đáp án là: B. 50. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một n hà máy phát điện đi với công suất 60kW, điện áp 600V, đến nơi tiêu thụ điện áp còn 5000V. Coi dây tải điện là thuần điện trở và điện áp tức thời u cùng pha với dòng điện tức thời i. Điện trở của dây tải là:
A. 100Ω
B. 30Ω
C. 20Ω
D. 40Ω Đáp án là: A. 100Ω </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Dãy gồm các kim loại đều phản ứng với nước ở nhiệt độ thường tạo ra dung dịch có môi trường bazơ là:
A. Na, Ba, K
B. Be, Na, Ca
C. Na, Fe, K
D. Na, Cr, K Đáp án là: A. Na, Ba, K </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Để thể hiện ranh giới quốc gia, người ta dùng kí hiệu nào sau đây?
A. Đường.
B. Điểm.
C. Diện tích.
D. Hình học. Đáp án là: A. Đường. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Hai vật: một vật được thả rơi tự do, một vật được ném ngang ở cùng độ cao. Kết luận nào sau đây là sai?
A. Gia tốc rơi như nhau.
B. Thời gian rơi như nhau.
C. Vận tốc chạm đất như nhau.
D. Công của trọng lực thực hiện được là bằng nhau. Đáp án là: C. Vận tốc chạm đất như nhau. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Các chất hữa cơ đơn chức Z 1, Z 2, Z 3 có CTPT tương ứng là CH 2 O, CH 2 O 2, C 2 H 4 O 2. Chúng thuộc các dãy đồng đẳng khác nhau. Công thức cấu tạo của Z 3 là
A. HCOOCH 3
B. CH 3 -O-CHO
C. HO-CH 2 -CHO
D. CH 3 COOCH 3 Đáp án là: A. HCOOCH 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nông sản chính của các đồng bằng Hoa Trung, Hoa Nam ở Trung Quốc không phải là
A. mía.
B. bông.
C. lúa mì.
D. chè. Đáp án là: C. lúa mì. </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 word that differs from the other three in the position ofprimary stress in each of the following questions.
A. situation
B. appropriate
C. informality
D. entertainment Đáp án là: B. appropriate </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các dãy số (u_n) sau đây, dãy số nào là cấp số nhân?
A. u_n=3n
B. u_n=2^n
C. u_n=1/(n)
D. u_n=2^n+1 Đáp án là: B. u_n=2^n </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Lực nào sau đây không phải là lực ma sát?
A. Lực xuất hiện khi bánh xe trượt trên mặt đường.
B. Lực xuất hiện khi lốp xe đạp lăn trên mặt đường.
C. Lực của dây cung tác dụng lên mũi tên khi bắn.
D. Lực xuất hiện khi các chi tiết máy cọ xát với nhau. Đáp án là: C. Lực của dây cung tác dụng lên mũi tên khi bắn. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi sử dụng gạch có lỗ thì khả năng cách âm tốt hơn so với gạch đúc. Lí giải nào sau đây là đúng nhất?
A. Gạch có lỗ dày hơn gạch đặc
B. Vật liệu làm gạch có lỗ truyền âm kém hơn gạch đặc
C. Gạch có lỗ khô hơn gạch đặc nên truyền âm chậm hơn
D. Các lỗ gạch chứa không khí nên âm truyền qua khó hơn Đáp án là: D. Các lỗ gạch chứa không khí nên âm truyền qua khó hơn </s> | [
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480,
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868,
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865,
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31214,
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<s> Chọn đáp án đúng với câu hỏi: Dung dịch NaOH phản ứng được với dung dịch của chất nào sau đây?
A. KNO 3.
B. K 2 SO 4.
C. NaHCO 3.
D. BaCl 2. Đáp án là: C. NaHCO 3. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: My sister has ______ some money to buy a new motorbike.
A. caught on
B. set aside
C. called off
D. given in Đáp án là: A. caught on </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Xác định vai trò ngữ pháp của thành ngữ trong câu “Mẹ đã phải một nắng hai sương vì chúng con”
A. Chủ ngữ
B. Vị ngữ
C. Bổ ngữ
D. Trạng ngữ Đáp án là: B. Vị ngữ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: A. species B. themes C. medicines D. plates
A. species
B. themes
C. medicines
D. plates Đáp án là: D. platesA </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các chất: N 2, H 2 S, SO 2, HBr, CO 2. Có bao nhiêu chất có phản ứng với O 2 ở điều kiện thích hợp?
A. 4.
B. 3.
C. 5.
D. 2. Đáp án là: A. 4. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nung 2,23 gam hỗn hợp X gồm các kim loại Fe, Al, Zn, Mg trong oxi, sau một thời gian thu được 2,71 g hỗn hợp Y. Hòa tan hoàn toàn Y trong dung dịch HNO 3 dư, thu được 0,672 lít khí NO ( sản phẩm khử duy nhất ở đktc). Số mol HNO 3 đã phản ứng là
A. 0,12
B. 0,18
C. 0,16
D. 0,14 Đáp án là: B. 0,18 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Những trường hợp nào dưới đây được xem như chuyển động bị biến đổi:
A. Xe đang chạy trên đường thẳng thì giảm tốc đi vào khúc quanh
B. Xe đang chạy lên một con dốc
C. Xe vừa chạy ra khỏi thành phố, tài xế bắt đầu tăng tốc chạy trên xa lộ
D. Cả A, B và C chuyển động đều bị biến đổi Đáp án là: A. Xe đang chạy trên đường thẳng thì giảm tốc đi vào khúc quanh </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho α+β+γ=π. Khi đó
A. tan(2α+2β)=tan2γ
B. cot(2α+2β)=cot2γ
C. sin(2α+2β)=sin2γ
D. cos(2α+2β)=cos2γ Đáp án là: D. cos(2α+2β)=cos2γ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dùng một bếp điện loại 200V – 1000W hoạt động ở hiệu điện thế U = 150V để làm sôi ấm nước. Bếp có hiệu suất là 80%. Sự toả nhiệt từ ấm ra không khí như sau: Nếu thử ngắt điện thì sau 1 phút nước hạ xuống 0,5 độ C. Ấm có m 1 = 100 g, c 1 = 600 J / k g. K, nước có m 2 = 500 g, c 2 = 4200 J / k g. K, nhiệt độ ban đầu là 20 độ C. Tính thời gian cần thiết để đun sôi.
A. 6 phút 40 giây
B. 6 phút 24 giây
C. 5 phút 7,2 giây
D. 9 phút 4 giây Đáp án là: A. 6 phút 40 giây </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về sự sắp xếp mạch rây và mạch gỗ tại miền hút của rễ, phát biểu nào dưới đây là đúng?
A. Mạch rây bao bên ngoài, mạch gỗ nằm ở phía trong
B. Mạch rây xếp một phía, mạch gỗ xếp ở phía đối diện
C. Mạch rây và mạch gỗ xếp xen kẽ nhau
D. Mạch gỗ bao bên ngoài, mạch rây nằm ở phía trong Đáp án là: C. Mạch rây và mạch gỗ xếp xen kẽ nhau </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mỗi bài ca dao phải có ít nhất mấy dòng?
A. 2 dòng
B. 3 dòng
C. 4 dòng
D. 5 dòng Đáp án là: A. 2 dòng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số trung bình cộng của 49 và 87 là?
A. 67
B. 68
C. 69
D. 70 Đáp án là: B. 68 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hoà tan hoàn toàn 24,4 gam hỗn hợp gồm FeCl 2 và NaCl (có tỉ lệ số mol tương ứng là 1 : 2) vào một lượng nưóc (dư), thu được dung dịch X. Cho dung dịch AgNO 3 (dư) vào dung dịch X, sau khi phản úng xảy ra hoàn toàn sinh ra m gam chất rắn. Giá trị của m là
A. 68,2
B. 28,7
C. 1 0,8
D. 57,4 Đáp án là: A. 68,2 </s> | [
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1,
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1,
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<s> Chọn đáp án đúng với câu hỏi: Chọn đáp án đúng
A.
B.
C.
D. Đáp án là: D. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: According to the passage, in the late 1960’s some residents of Boston were concerned with which aspect of skyscrapers?
A. The noise from their construction
B. The removal of trees from building sites
C. The harmful effects on the city’s grass
D. The high cost of rentable office space Đáp án là: C. The harmful effects on the city’s grass </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong các chất sau, chất nào có nhiệt độ sôi cao nhất?
A. etanol.
B. đimetylete.
C. metanol.
D. nước. Đáp án là: D. nước </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về quá trình hình thành loài mới theo quan điểm tiến hóa hiện đại, có bao nhiêu phát biểu sau đây là đúng? 1. Hình thành loài mới bằng con đường sinh thái thường gặp ở thực vật và động vật ít di chuyển xa. 2. Hình thành loài bằng con đường lai xa và đa bội hóa thường xảy ra phổ biến ở thực vật. 3. Hình thành loài bằng con đường cách li địa lý thường xảy ra một cách chậm chạp qua nhiều gian đoạn trung gian chuyển tiếp. 4. Hình thành loài là quá trình tích lũy các biến đổi đồng loạt do tác động trực tiếp của ngoại cảnh hoặc do tập quán hoạt động của động vật. 5. Trong quá trình hình thành loài khác khu vực địa lý, thì điều kiện địa lý là nguyên nhân trực tiếp gây ra những biến đổi tương ứng trên cơ thể sinh vật, từ đó tạo thành loài mới.
A. 3
B. 2
C. 4
D. 1 Đáp án là: A. 3 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phần trắc nghiệm (2 điểm)Gía trị của x thỏa mãn x2 + 16 = 8x là
A. x = 8
B. x = 4
C. x = -8
D. x= -4 Đáp án là: B. x = 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cuộc kháng chiến chống thực dân Pháp của nhân dân ta đến năm 1951 là năm thứ mấy?
A. Năm thứ sáu.
B. Năm thứ bảy.
C. Năm thứ tám.
D. Năm thứ năm. Đáp án là: A. Năm thứ sáu. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vùng nội địa và Tây Nam Á phổ biến cảnh quan nào sau đây?
A. Cảnh quan rừng lá kim.
B. Cảnh quan thảo nguyên.
C. Cảnh quan rừng nhiệt đới thường xanh.
D. Cảnh quan hoang mạc và bán hoang mạc. Đáp án là: D. Cảnh quan hoang mạc và bán hoang mạc </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong không gian tọa độ Oxyz, cho mặt cầu (S) có đường kính AB, với A (6;2;-5), B (-4;0;7). Viết phương trình mp (P) tiếp xúc với mặt cầu (S) tại A.
A. (P): 5x + y – 6z +62 = 0
B. (P): 5x + y – 6z - 62 = 0
C. (P): 5x - y – 6z - 62 = 0
D. (P): 5x + y + 6z +62 = 0 Đáp án là: B. (P): 5x + y – 6z - 62 = 0 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tính bán kính R của đường tròn ngoại tiếp tam giác đều ABC cạnh 2cm
A.R=(√(3))/3cm
B.R=√(3)cm
C.R=(2√(3))/3cm
D.R=2√(3)cm Đáp án là: C.R=(2√(3))/3cm </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Căn cứ vào nguồn gốc, nguồn lực bao gồm các bộ phận nào sau đây?
A. Vị trí địa lí và tự nhiên.
B. Tự nhiên và kinh tế - xã hội
C. Vị trí địa lí và kinh tế - xã hội.
D. Vị trí địa lí, tự nhiên, kinh tế - xã hội. Đáp án là: D. Vị trí địa lí, tự nhiên, kinh tế - xã hội </s> | [
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<s> Chọn đáp án đúng với câu hỏi: A. contradictory B. auditorium C. beneficiary D. impenetrab
A. contradictory
B. auditorium
C. beneficiary
D. impenetrab Đáp án là: D. impenetrabA </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Phương thức biểu đạt chính được sử dụng ở văn bản Bàn luận về phép học?
A. Tự sự
B. Biểu cảm
C. Nghị luận
D. Thuyết minh Đáp án là: C. Nghị luận </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. stopp ed
B. want ed
C. work ed
D. forc ed Đáp án là: B. want ed </s> | [
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1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Sau nghi lễ bái tổ là nghi lễ gì?
A. Keo vật thờ
B. Giới thiệu hai đô vật
C. Xe đài
D. Thắp hương dâng lễ vật Đáp án là: C. Xe đài </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dãy các chất đều có khả năng tham gia phản ứng thủy phân trong dung dịch H2SO4 đun nóng là
A. glucozơ, tinh bột và xenlulozơ
B. fructozơ, saccarozơ và tinh bột
C. saccarozơ và fructozơ, tinh bột
D. saccarozơ, tinh bột và xenlulozơ Đáp án là: D. saccarozơ, tinh bột và xenlulozơ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Originally (5) _______to help children whose fathers had died, AFDC evolved into the main source of regular income for millions of poor American families.
A. design
B. designed
C. designing
D. having designed Đáp án là: B. designed </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đặt điện áp u = U o cos(ωt + π 4 ) vào hai đầu đoạn mạch chỉ có tụ điện thì cường độ dòng điện trong mạch là i = I o cos(ωt + φ i ). Giá trị của φ i là
A. - π 2
B. - 3 π 4
C. π 2
D. 3 π 4 Đáp án là: D. 3 π 4 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đặc điểm nào sau đây là điểm giống nhau giữa interferon và vaccine?
A. Đều là chất do virus sản xuất ra.
B. Đều có tính đặc hiệu với virus.
C. Đều có tác dụng kích thích cơ thể sản xuất ra kháng thể.
D. Đều có tác dụng tăng cường khả năng miễn dịch cho cơ thể. Đáp án là: D. Đều có tác dụng tăng cường khả năng miễn dịch cho cơ thể </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ánh sáng vàng có bước sóng trong chân không là 0,5893 μm. Tần số của ánh sáng vàng là
A. 5,05.10 14 Hz.
B. 5,16.10 14 Hz.
C. 6,01.10 14 Hz.
D. 5,09.10 14 Hz. Đáp án là: D. 5,09 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vi khuẩn Helicobacter pylori – thủ phạm gây viêm loét dạ dày – kí sinh ở đâu trên thành cơ quan này?
A. Lớp dưới niêm mạc
B. Lớp niêm mạc
C. Lớp cơ
D. Lớp màng bọc Đáp án là: A. Lớp dưới niêm mạc </s> | [
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<s> Chọn đáp án đúng với câu hỏi: ................. do you spell your name?
A. Where
B. How
C. What
D. When Đáp án là: B. How </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vì sao sự đẻ con lại được xem là hình thức sinh sản hoàn chỉnh hơn so với sự đẻ trứng?
A. Vì trong sự đẻ con, phôi được phát triển trong cơ thể mẹ nên an toàn hơn.
B. Vì trong sự đẻ con, phôi được phát triển trong cơ thể của bố nên an toàn hơn.
C. Vì trong sự đẻ con, xác suất trứng gặp tinh trùng là thấp hơn.
D. Cả A, B, C đều sai. Đáp án là: A. Vì trong sự đẻ con, phôi được phát triển trong cơ thể mẹ nên an toàn hơn. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tác động nào của con người không vì sự phát triển bền vững?
A. Khai thác khoáng sản với số lượng lớn để xuất khẩu
B. trồng rừng, bảo tồn các loài sinh vật quý hiếm
C. Xử lý chất thải độc hại trước khi thải vào không khí
D. Bón phân cải tạo đất trồng, cày xới đất tơi xốp Đáp án là: A. Khai thác khoáng sản với số lượng lớn để xuất khẩu </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Vật phát ra âm to hơn khi nào?
A. Khi vật dao động nhanh hơn
B. Khi vật dao động mạnh hơn
C. Khi vật dao động lớn hơn
D. Tất cả các trường hợp trên Đáp án là: B. Khi vật dao động mạnh hơn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: If you honor me, I will appreciate it.
A. If I am to be honored, it is to be appreciated.
B. Thank you for your appreciation to honor me.
C. Because of your honor, I will appreciate.
D. You are appreciated to honor me. Đáp án là: A. If I am to be honored, it is to be appreciated. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong cơ cấu dân số phân theo nhóm tuổi của Nhật Bản năm 2005, chiếm tỉ trọng từ cao xuống thấp lần lượt là các nhóm tuổi
A. dưới 15 tuổi, từ 15 - 64 tuổi, 65 tuổi trở lên
B. từ 15 - 64 tuổi, 65 tuổi trở lên, dưới 15 tuổi
C. 65 tuổi trở lên, từ 15 - 64 tuổi, dưới 15 tuổi
D. từ 15 - 64 tuổi, dưới 15 tuổi, 65 tuổi trở lên Đáp án là: B. từ 15 - 64 tuổi, 65 tuổi trở lên, dưới 15 tuổi </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Nội dung nào dưới đây khẳng định độc lập chủ quyền của dân tộc ta trên phương diện pháp lí và thực tiễn?
A. Một dân tộc đã gan góc chống ách nô lệ của thực Pháp hơn 80 năm nay... dân tộc đó phải được tự do, dân tộc đó phải được độc lập.
B. Nước Việt Nam có quyền hưởng tự do, độc lập và thật sự đã trở thành một nước tự do, độc lập.
C. Toàn thể dân tộc Việt Nam quyết đem tinh thần và lực lượng, tính mạng và của cải để giữ vững quyền tự do, độc lập ấy.
D. Tất cả các nội dung trên. Đáp án là: B. Nước Việt Nam có quyền hưởng tự do, độc lập và thật sự đã trở thành một nước tự do, độc lập. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hai tập hợp A = (m−1; 5) và B = (3; +∞). Tìm tất cả các giá trị thực của tham số m để A∖B = ∅
A. m ≥ 4
B. m = 4
C. 4 ≤ m < 6
D. 4 ≤ m ≤ 6 Đáp án là: C. 4 ≤ m < 6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Căn cứ Atlat Địa lí Việt Nam trang 8, cho biết nơi nào sau đây có quặng titan?
A. Hàm Tân.
B. Vĩnh Hảo.
C. Di Linh.
D. Đà Lạt. Đáp án là: A. Hàm Tân. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Điều không đúng với sinh sản vô tính ở động vật là
A. cá thể có thể sống độc lập, đơn lẻ vẫn sinh sản bình thường.
B. đảm bảo sự ổn định về mặt di truyền qua các thế hệ cơ thể.
C. tạo ra số lượng lớn con cháu trong thời gian ngắn.
D. có khả năng thích nghi cao với sự thay đổi của điều kiện môi trường Đáp án là: D. có khả năng thích nghi cao với sự thay đổi của điều kiện môi trường </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Some of the household products that ______ hazardous chemicals are oven cleaners, toilet-bowl cleaners, etc.
A. consist of
B. comprise
C. contain
D. include Đáp án là: C. contain </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tìm tập xác định D của hàm số y=√(log_3x-log_3(2x-1))
A. (1/2;1]
B. (0;1)
C. (1;+∞)
D. (1/2;+∞] Đáp án là: A. (1/2;1] </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một hỗn hợp A gồm 2 hiđrocacbon X, Y liên tiếp nhau trong cùng dãy đồng đẳng. Đốt cháy 11,2 lít hỗn hợp X thu được 57,2 gam CO 2 và 23,4 gam H 2 O. CTPT X, Y và khối lượng của X, Y là:
A. 12,6 gam C 3 H 6 và 11,2 gam C 4 H 8.
B. 8,6 gam C 3 H 6 và 11,2 gam C 4 H 8.
C. 5,6 gam C 2 H 4 và 12,6 gam C 3 H 6.
D. 2,8 gam C 2 H 4 và 16,8 gam C 3 H 6. Đáp án là: C. 5,6 gam C 2 H 4 và 12,6 gam C 3 H 6. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho m gam hỗn hợp B gồm CuO, Na 2 O, A l 2 O 3 hoà tan hết vào nước thu được 400ml dung dịch D ch ỉ chứa một chất tan duy nhất có nồng độ 0,5M và chất rắn G ch ỉ gồm một chất. Lọc tách G, cho luồng khí H 2 dư qua G nung nóng thu được chất rắn F. Hoà tan hết F trong dung dịch HNO 3 thu được 0,448 lít (đktc) hỗn hợp kh í gồm NO 2 và NO tỉ khối so với oxi bằng 1,0625. Biết các phản ứng xảy ra hoàn toàn. Tính m
A. 34,8g
B. 18g
C. 18,4 g
D. 26 g Đáp án là: C. 18,4 g </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho a gam glucozơ phản ứng với dung dịch AgNO 3 / NH 3 tạo thành a gam Ag. Phần trăm của glucozơ tham gia phản ứng là
A. 83,33%.
B. 41,66%.
C. 75,00%.
D.37,50%. Đáp án là: A. 83,33%. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho các chất sau: Al, ZnO, CH 3 COONH 4, KHSO 4, H 2 NCH 2 COOH, H 2 NCH 2 COONa, KHCO 3, Pb(OH) 2, ClH 3 NCH 2 COOH, HOOCCH 2 CH(NH 2 )COOH. Số chất có tính lưỡng tính là:
A. 6
B. 7
C. 8
D. 5 Đáp án là: A. 6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khối lượng riêng của kim loại canxi là 1, 55 g / c m 3. Khối lượng mol của nguyên tử canxi là 40 g/mol. Trong tinh thể canxi, các nguyên tử là những hình cầu chiếm 74% thể tích tinh thể, phần còn lại là khe rỗng. Bán kính nguyên tử canxi tính theo lí thuyết là
A. 0,196 nm.
B. 0,185 nm.
C. 0,168 nm.
D. 0,155nm. Đáp án là: A. 0,196 nm. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hàm số \[f\left( x \right) = \sqrt {x - 1} \]. Đạo hàm của hàm số tại \(x = 1\)là
A. \[\frac{1}{2}\].
B. \[1\].
C. \[0\]
D. Không tồn tại. Đáp án là: D. Không tồn tại </s> | [
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<s> Chọn đáp án đúng với câu hỏi: This library card will give you free access ______ the Internet eight hours a day.”
A. to
B. in
C. on
D. from Đáp án là: A. to </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,
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: When you catch someone's ______ you do something to attract his attention so that you can talk to him.
A. head
B. hand
C. eye
D. ear Đáp án là: C. eye </s> | [
1,
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29875,
29901,
1932,
366,
4380,
4856,
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29879,
903,
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366,
437,
15... | [
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1,
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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: Lựa chọn đáp án đúng nhất:Một khối sắt dạng hình hộp chữ nhật có chiều dài 15 dm, chiều rộng 1,2 m và chiều cao là 0,9 m. Tính thể tích của khối sắt đó.
A. 1520 dm^3
B. 1530 dm^3
C. 1620 dm^3
D. 1630 dm^3 Đáp án là: C. 1620 dm^3 </s> | [
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365,
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298... | [
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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: Trong các chất sau đây, chất nào có nhiệt độ sôi cao nhất?
A. CH 3 CH 2 OH.
B. CH 3 COOH.
C. CH 3 CH 2 CH 2 CH 3
D. CH 3 CHO. Đáp án là: B. CH 3 COOH. </s> | [
1,
1,
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29901,
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12507,
298... | [
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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 hai điện tích q 1 = 2.10 - 6 C, q 2 = - 2.10 - 6 C, đặt tại hai điểm A, B trong chân không và cách nhau một khoảng 6cm. Một điện tích q 3 = 2.10 - 6 C, đặt trên đường trung trực của AB, cách AB một khoảng 4 cm. Độ lớn của lực điện do hai điện tích q 1 v à q 2 tác dụng lên điện tích q 3 là
A. 14,40N
B. 17,28 N
C. 20,36 N
D. 28,80N Đáp án là: B. 17,28 N </s> | [
1,
1,
29871,
678,
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29876,
29871,
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29886,
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3189,
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447,
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347,
31214,
31500,
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1953... | [
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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: Giả sử 1 cây ăn quả của 1 loài thực vật tự thụ phấn có kiểu gen AaBb. Theo lí thuyết, phát biểu nào sau đây sai?
A. Các cây con được tạo ra từ cây này bằng phương pháp nuôi cấy mô sẽ có đặc tính di truyền giống nhau và giống cây mẹ
B. Nếu gieo hạt của cây này thì có thể thu được cây con có kiểu gen đồng hợp tử trội về các gen trên.
C. Nếu đem nuôi cấy hạt phấn của cây này rồi gây lưỡng bội hóa thì có thể thu được cây con có kiểu gen AaBB
D. Nếu chiết cành từ cây này đem trồng, người ta sẽ thu được cây con có kiểu gen AaBb. Đáp án là: C. Nếu đem nuôi cấy hạt phấn của cây này rồi gây lưỡng bội hóa thì có thể thu được cây con có kiểu gen AaBB </s> | [
1,
1,
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480,
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1... |
<s> Chọn đáp án đúng với câu hỏi: We ought to keep these proposals secret from the chairman for the time being.
A. revealed
B. frequented
C. accessible
D. lively Đáp án là: A. revealed </s> | [
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29901,
1334,
12722,
304,
3013,
1438,
9551,
1338,
7035,
515,
278,
28942,
36... | [
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1,
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1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Tiểu thuyết nổi tiếng “Những người khốn khổ” là tác phẩm của
A. Vích-to Huy-gô.
B. Lép Tôn-xtôi.
C. Mác-tuên.
D. Ban-dắc. Đáp án là: A. Vích-to Huy-gô. </s> | [
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323,
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266,
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4099,
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2... | [
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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: Phát biểu nào sau đây sai? Người ta nhận ra từ trường tồn tại xung quanh dây dẫn mang dòng điện vì
A. có lực tác dụng lên một dòng điện khác đặt song song cạnh nó.
B. có lực tác dụng lên một kim nam châm đặt song song cạnh nó.
C. có lực tác dụng lên một hạt mang điện chuyển động dọc theo nó.
D. có lực tác dụng lên một hạt mang điện đứng yên đặt bên cạnh nó. Đáp án là: D. có lực tác dụng lên một hạt mang điện đứng yên đặt bên cạnh nó </s> | [
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207,
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