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<s> Chọn đáp án đúng với câu hỏi: Make sure you close all the windows _______.
A. before you leave
B. until you will leave
C. after you had left
D. when you left Đáp án là: A. before you leave </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi xảy ra hiện tượng cộng hưởng thì:
A. Vật dao động với tần số lớn hơn tần số dao động riêng
B. Vật dao động với tần số nhỏ hơn tần số dao động riêng
C. Ngoại lực thôi không tác dụng lên vật
D. Năng lượng dao động của vật đạt giá trị lớn nhất Đáp án là: D. Năng lượng dao động của vật đạt giá trị lớn nhất </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mark the letter A, B, C, D on your answer sheet to indicate the word that differs from the rest in the position of the main stress.
A. surgery
B. discover
C. irrigate
D. vaporize Đáp án là: B. discover </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Khi nói về các loại quang phổ, phát biểu nào sau đây là sai?
A. Quang phổ liên tục phụ thuộc vào nhiệt độ của nguồn phát mà không phụ thuộc vào bản chất của nguồn phát
B. Quang phổ vạch phát xạ do chất rắn và chất lỏng phát ra khi bị nung nóng
C. Quang phổ vạch phát xạ của một nguyên tố là một hệ thống những vạch sáng (vạch màu) riêng lẻ, ngăn cách nhau bằng những khoảng tối
D. Quang phổ liên tục thiếu một số vạch màu do bị chất khí (hay hơi kim loại) hấp thụ được gọi là quang phổ vạch hấp thụ của khí (hay hơi) đó Đáp án là: B. Quang phổ vạch phát xạ do chất rắn và chất lỏng phát ra khi bị nung nóng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Biết: 534 : x = 24 : 4. Giá trị của x là:
A. 89
B. 79
C. 69
D. 59 Đáp án là: A. 89 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tìm x biết 2(x)/7−=75/35
A. x = 1
B. x = 2
C. x = 3
D. x = 4 Đáp án là: A. x = 1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose a word in each line that has different stress pattern.
A. collect
B. institution
C. spectacular
D. administer Đáp án là: B. institution </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong phân tử của cacbohyđrat luôn có
A. nhóm chức ancol
B. nhóm chức xeton
C. nhóm chức anđehit
D. nhóm chức axit Đáp án là: A. nhóm chức ancol </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Để tìm hiểu về chế độ nước ta của một con sông, cần phải sử dụng bản đồ nào?
A. Bản đồ khí hậu.
B. Bản đồ địa hình.
C. Bản đồ địa chất.
D. Bản đồ nông nghiệp. Đáp án là: A. Bản đồ khí hậu. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đề bài: Choose the best answer: I’ll never forget the day........ I first met you.
A. where
B. which
C. what
D. when Đáp án là: D. when </s> | [
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<s> Chọn đáp án đúng với câu hỏi: According to paragraph 2, what is the purpose of advertising?
A. It creates an intense desire to own a particular product.
B. It tries to promote products endorsed by top celebrities.
C. It creates a misleading impression on products.
D. It encourages ordinary people to promote products like their idols. Đáp án là: A. It creates an intense desire to own a particular product. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cacbohiđrat là gì?
A. Cacbohiđrat là những hợp chất hữu cơ đa chức.
B. Cacbohiđrat là những hợp chất hữu cơ tạp chức và đa số chúng có công thức chung là C n (H 2 O) m.
C. Cacbohiđrat là những hợp chất hữu cơ tạp chức.
D. Cacbohiđrat là những hợp chất hữu cơ đa chức và đa số chúng có công thức chung là C n (H 2 O) m. Đáp án là: B. Cacbohiđrat là những hợp chất hữu cơ tạp chức và đa số chúng có công thức chung là C n (H 2 O) m. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho hàm số y=1/3x^3+mx^2+4x+2011. Có bao nhiêu giá trị nguyên của tham số m để hàm số không có điểm cực trị?
A. 5
B. vô số
C. 3
D. 4 Đáp án là: A. 5 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Máy phát điện xoay chiều một pha và ba pha giống nhau ở điểm nào?
A. Đều có phần ứng quang, phần cảm cố định.
B. Đều có bộ góp điện để dẫn điện ra mạch ngoài.
C. đều có nguyên tắc hoạt động dựa trên hiện tượng cảm ứng điện từ.
D. Trong mỗi vòng dây của rôto, suất điện động của máy đều biến thiên tuần hoàn hai lần. Đáp án là: C. đều có nguyên tắc hoạt động dựa trên hiện tượng cảm ứng điện từ. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trạng thái cân bằng của quần thể là trạng thái số lượng cá thể ổn định do
A. sức sinh sản giảm, sự tử vong giảm
B. sức sinh sản giảm, sự tử vong tăng
C. sức sinh sản tăng, sự tử vong giảm
D. sự thống nhất tương quan giữa tỉ lệ sinh và tỉ lệ tử vong của quần thể Đáp án là: D. sự thống nhất tương quan giữa tỉ lệ sinh và tỉ lệ tử vong của quần thể </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Why is the example of the Industrial Revolution given?
A. It was also a time of great change in the workplace.
B. It had far less of an effect than the Digital Revolution.
C. It lead to widespread unemployment in the world.
D. It resulted in a more violent society. Đáp án là: A. It was also a time of great change in the workplace. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ancol etylic và phenol đều có phản ứng với
A. CH 3 COOH (H 2 SO 4 đặc, đun nóng).
B. nước brom
C. Na
D. NaOH Đáp án là: C. Na </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Polietilen là sản phẩm của phản ứng trùng hợp
A. CH 2 =CH-CH 3.
B. CH 2 =CH 2.
C. CH 2 =CH-Cl.
D. CH 2 =CH-CH=CH 2 Đáp án là: B. CH 2 =CH 2. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Túi thứ nhất chứa 63kg gạo. Số gạo ở túi thứ hai gấp 3 lần túi gạo thứ nhất. Hỏi cả hai túi chứa bao nhiêu kg gạo?
A. 126kg
B. 189 kg
C. 63 kg
D. 252kg Đáp án là: D. 252kg </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một xưởng in có 8 máy in, mỗi máy in được 4000 bản in khổ giấy A4 trong một giờ. Chi phí để bảo trì, vận hành một máy mỗi lần in là 50 nghìn đồng. Chi phí in ấn của n máy chạy trong một giờ là \(20\left( {3n + 5} \right)\) nghìn đồng. Hỏi nếu in 50 000 bản in khổ A4 thì phải sử dụng bao nhiêu máy để thu được lãi nhiều nhất?
A. 6 máy
B. 7 máy
C. 5 máy
D. 4 máy Đáp án là: C. 5 máy </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cuộc khởi nghĩa của Hoàng Công Chất bùng nổ vào năm nào?
A. 1769.
B. 1751.
C. 1741.
D. 1739. Đáp án là: D. 1739 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: ADN được cấu tạo từ các đơn phân là
A. axit amin
B. nucleotit
C. glucozo
D. axit béo Đáp án là: B. nucleotit </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho a→=(1;2), b→=(−2;3). Góc giữa hai vectơ u→=3a→+2b→ và v→=a→−5b→ bằng
A. 45°;
B. 60°;
C. 90°;
D. 135°. Đáp án là: D. 135° </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hỗn hợp gồm C 2 H 2, C 3 H 6, C 3 H 8 để thu được C 3 H 8 tinh khiết người ta cho hỗn hợp lội chậm qua:
A. dd NaOH.
B. dd K M n O 4.
C. dd A g N O 3 / N H 3.
D. B r 2 nguyên chất. Đáp án là: C. dd A g N O 3 / N H 3. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở người, bệnh mù màu (đỏ và lục) là do đột biến lặn nằm trên nhiễm sắc thể giới tính X gây nên (X m ). Nếu mẹ bình thường, bố bị mù màu thì con trai bị mù màu của họ đã nhận X m từ
A. bố.
B. mẹ.
C. ông nội.
D. bà nội. Đáp án là: B. mẹ. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tên gọi của hợp chất sau là:
A. 3-metyl-hept-6-en-3-ol
B. 4-metyl-hept-1-en-5-ol
C. 3-metyl-hept-4-en-3-ol
D. 4-metyl-hept-6-en-3-ol. Đáp án là: D. 4-metyl-hept-6-en-3-ol </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở một loài thực vật, tính trạng màu sắc hoa do một gen có 3 alen A1, A2, A3 qui định. Trong đó alen A1 qui định hoa đỏ, trội hoàn toàn so với alen A2 qui định hoa vàng trội hoàn toàn so với alen A3 qui định hoa trắng. Cho các cây hoa đỏ P giao phấn với nhau, thu được các hợp tử F 1. Gây đột biến tứ bội hóa các hợp tử F 1 thu được các cây tứ bội. Lấy một cây tứ bội có hoa đỏ ở F 1 cho tự thụ phấn, thu được F 2 có kiểu hình cây hoa vàng chiếm tỉ lệ 1/36. Cho rằng cây tứ bội giảm phân chỉ sinh giao tử lưỡng bội, các giao tử lưỡng bội thụ tinh với xác suất như nhau. Theo lí thuyết, có bao nhiêu phát biểu đúng về F 2? I. Loại kiểu gen chỉ có 1 alen A1 chiếm tỉ lệ 1/36 II. Loại kiểu gen chỉ có 1 alen A3 chiếm tỉ lệ 2/9 III. Có 4 loại kiểu gen qui định kiểu hình hoa đỏ và 1 loại kiểu gen qui định kiểu hình hoa vàng. IV. Lấy ngẫu nhiên 1 cây hoa vàng, xác suất thu được cây không mang alen A3 là 1/35
A. 1
B. 3
C. 4
D. 2 Đáp án là: A. 1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho 17,15 gam hỗn hợp X gồm Ba và Na vào nước thu được dung dịch Y và 3,92 lít khí H 2 (đktc). Cho khí CO 2 vào dung dịch Y. Cho V lít khí CO 2 (đktc) vào dung dịch Y thấy lượng kết tủa thu được là lớn nhất. Giá trị của V là:
A. 2,24 ≤V≤ 5,6
B. 2,24 ≤V≤ 4,48
C. 3,92 ≤V≤ 5,6
D. 2,24 ≤V≤ 3,92 hoặc V= 5,6 Đáp án là: A. 2,24 ≤V≤ 5,6 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Việt Nam có thể rút ra bài học nào từ sự phát triển kinh tế của Mĩ và Nhật Bản sau Chiến tranh thế giới thứ hai?
A. Tranh thủ giá nguyên liệu rẻ từ các nước thế giới thứ ba.
B. Áp dụng thành tựu khoa học hiện đại.
C. Liên kết chặt chẽ với châu Âu.
D. Kêu gọi vốn đầu tư từ bên ngoài. Đáp án là: B. Áp dụng thành tựu khoa học hiện đại. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: That T-shirt is the______we have in stock.
A. big
B. bigger
C. small
D. smallest Đáp án là: D. smallest </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một vận động viên nhảy cầu trong hồ nước. Khi nhảy, độ cao h từ người đó tới mặt nước (tính bằng mét) phụ thuộc vào khoảng cách x từ điểm rơi đến chân cầu (tính bằng mét) bởi công thức h=−(x−1)^2+4. Khi vận động viên cách mặt nước 3m tính khoảng cách x
A.x=0
B.x=2
C.(x=0x=2)
D.x=3 Đáp án là: B.x=2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Dung dịch có pH >7, tác dụng được với dung dịch K 2 SO 4 tạo kết tủa là:
A. NaOH
B. H 2 SO 4
C. Ba(OH) 2
D. BaCl 2 Đáp án là: C. Ba(OH) 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Bản chất của dòng điện trong chất bán dẫn là:
A. Dòng chuyển dời có hướng của các electron và lỗ trống ngược chiều điện trường
B. Dòng chuyển dời có hướng của các electron và lỗ trống cùng chiều điện trường
C. Dòng chuyển dời có hướng của các electron theo chiều điện trường và các lỗ trống ngược chiều điện trường
D. Dòng chuyển dời có hướng của các lỗ trống theo chiều điện trường và các electron ngược chiều điện trường Đáp án là: D. Dòng chuyển dời có hướng của các lỗ trống theo chiều điện trường và các electron ngược chiều điện trường </s> | [
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<s> Chọn đáp án đúng với câu hỏi: I've lived here________ 1990.
A. since
B. from
C. to
D. for Đáp án là: A. since </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Có hai dãy ghế đối diện nhau, mỗi dãy có ba ghế. Xếp ngẫu nhiên 6 học sinh, gồm 3 nam và 3 nữ, ngồi vào hai dãy ghế đó sao cho mỗi ghế có đúng một học sinh ngồi. Xác suất để mỗi học sinh nam đều ngồi đối diện với một học sinh nữ bằng
A. \(\frac{2}{5}\);
B. \(\frac{1}{{20}}\);
C. \(\frac{3}{5}\);
D. \(\frac{1}{{10}}\). Đáp án là: A. \(\frac{2}{5}\); </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ý nào không phải nét đặc sắc nghệ thuật trong bài "Văn tế nghĩa sĩ Cần Giuộc"?
A. Sử dụng lối văn biền ngẫu, uyển chuyển, giàu hình ảnh
B. Ngôn ngữ chân thực, giàu cảm xúc
C. Thủ pháp liệt kê, đối lập
D. Ngôn ngữ, hình ảnh bóng bẩy Đáp án là: D. Ngôn ngữ, hình ảnh bóng bẩy </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tác phẩm nào sau đây không phải của Nguyễn Tuân?
A. Vang bóng một thời
B. Tùy bút sông Đà
C. Hà Nội ta đánh Mỹ giỏi
D. Mùa lá rụng trong vườn Đáp án là: D. Mùa lá rụng trong vườn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đối tượng nào dưới đây có quá trình dị hoá diễn ra mạnh mẽ hơn quá trình đồng hoá
A. Người cao tuổi
B. Thanh niên
C. Trẻ sơ sinh
D. Thiếu niên Đáp án là: A. Người cao tuổi </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thành phần dân cư Hoa Kỳ rất đa dạng. Hiện nay dân số Hoa Kỳ có nguồn gốc Châu Âu chiểm tỉ lệ
A. 86%
B. 85%
C. 81%
D. 83% Đáp án là: D. 83% </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở Việt Nam, đơn vị chính để đo nhiệt độ là:
A. ml
B. gam
C. ^0C
D. mm Đáp án là: C. ^0C </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hòa tan hoàn toàn 6,5 gam Zn trong dung dịch HNO 3 loãng, dư thu được dung dịch X và 0,224 lít khí N 2 (đktc). Khối lượng muối trong dung dịch X là
A. 18,90 gam.
B. 17,80 gam.
C. 19,9 gam.
D. 28,35 gam. Đáp án là: C. 19,9 gam. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tập xác định của hàm số y=(x−1)1/^3 là:
A. R
B. (1;+∞).
C. R\(1).
D. (1;+∞). Đáp án là: D. (1;+∞) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở nước ta, ngành công nghiệp nào cần được ưu tiên đi trước một bước?
A. Điện lực
B. Sản xuất hàng tiêu dùng
C. Chế biến dầu khí
D. Chế biến nông – lâm – thủy sản Đáp án là: A. Điện lực </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thí nghiệm giao thoa với khe Young ánh sáng có bước sóng λ. Tại A cách S 1 đoạn d 1 và cách S 2 đoạn d 2 có vân tối khi
A. d 2 − d 1 = kλ (với k = 0,+1,+2,...).
B. d 2 − d 1 = (k − 0,5)λ (với k = 0,+1,+2,...).
C. d 2 − d 1 = (kλ + λ 4 ) (với k = 0,+1,+2,...).
D. d 2 − d 1 = 2kλ (với k = 0,+1,+2,...). Đáp án là: B. d 2 − d 1 = (k − 0,5)λ (với k = 0,+1,+2,...). </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hiđrat hóa hoàn toàn m gam một hi đrocacbon X với xúc tác Hg 2+ ở 80 0 C thu được dung dịch Y. Thêm dung dịch AgNO 3 dư trong NH 3 vào Y thấy tách ra 43,2 gam Ag, biết các phản ứng xảy ra hoàn toàn. Giá trị của m là
A.5,6
B.5,2
C.1,6
D.3,2 Đáp án là: B.5,2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một con lắc đơn gồm quả cầu nhỏ khối lượng m được treo vào một đầu sợi dây mềm, nhẹ, không dãn, dài 81cm. Con lắc dao động điều hòa tại nơi có gia tốc trọng trường g. Lấy g = π 2 (m/s 2 ). Chu kỳ dao động của con lắc là:
A. 0,5s
B. 1,6s
C. 1,8s
D. 2s Đáp án là: C. 1,8s </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Đặc điểm của kiểu bay vỗ cánh là:
A. Cánh dang rộng mà không đập
B. Cánh đập chậm rãi và không liên tục
C. Bay chủ yếu dựa vào sự nâng đỡ của không khí và hướng thay đổi của các luồng gió
D. Cánh đập liên tục Đáp án là: D. Cánh đập liên tục </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tác phẩm Phương ngôn Việt Nam của Bùi Mạnh Nhị thuộc thể loại nào?
A. Thơ
B. Truyện
C. Kí
D. Luận văn Đáp án là: D. Luận văn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Tìm phát biểu sai
A. Hiện tượng đoản mạch xảy ra khi điện trở của mạch ngoài rất nhỏ
B. Suất điện động E của nguồn điện luôn có giá trị bằng độ giảm điện thế mạch trong
C. Suất điện động E của nguồn điện có giá trị bằng tốc độ giảm thế ở mạch ngoài và mạch trong
D. Điện trở toàn phần của toàn mạch là tổng giá trị số của điện trở trong và điện trở tương đương của mạch ngoài Đáp án là: B. Suất điện động E của nguồn điện luôn có giá trị bằng độ giảm điện thế mạch trong </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ảnh hưởng của nhóm - OH đến gốc C 6 H 5 - trong phân tử phenol thể hiện qua phản ứng giữa phenol với:
A. Na kim loại.
B. H 2 (Ni, nung nóng).
C. dung dịch NaOH.
D. nước Br 2. Đáp án là: C. dung dịch NaOH. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở ruồi giấm, giả sử cặp gen thứ nhất gồm 2 alen A,a nằm trên NST số 1, cặp gen thứ 2 gồm 2 alen B,b và cặp gen thứ ba gồm 2 alen D,d cùng nằm trên NST số 2 và cách nhau 40cm, cặp gen thứ tư gồm 2 alen E,e nằm trên cặp NST giới tính. Nếu mỗi gen quy định 1 tính trạng và tính trạng trội là trội hoàn toàn, nếu lai giữa cặp bố mẹ: thì ở đời con kiểu hình gồm 3 tính trạng trội và 1 tính trạng lặn chiếm tỷ lệ là:
A. 25%
B. 6,25%
C. 37,5%
D. 32,5% Đáp án là: D. 32,5% </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... |
<s> Chọn đáp án đúng với câu hỏi: Đốt cháy hoàn toàn 1,1 gam hợp chất hữu cơ đơn chức X, thu được 2,2 gam CO 2 và 0,9 gam H 2 O. X có khả năng tham gia phản ứng với NaOH. Số đồng phân của X là:
A. 3.
B. 4.
C. 5.
D. 6. Đáp án là: D. 6 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Ngày 5 tháng 7 là thứ Sáu thì ngày 10 tháng 7 cùng năm đó là thứ mấy?
A. Thứ Hai
B. Thứ Ba
C. Thứ Tư
D. Thứ Năm Đáp án là: C. Thứ Tư </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Tiến hành các thí nghiệm: (a) Cho AgN O 3 vào dung dịch F e N O 3 2. (b) Dẫn N H 3 qua ống đựng CuO nung nóng. (c) Nhiệt phân AgN O 3. (d) Cho Al vào dung dịch F e 2 S O 4 3 dư. (e) Cho K vào dung dịch C u N O 3 2. Sau khi kết thúc các phản ứng, số thí nghiệm có tạo thành kim loại là
A.2
B.1
C.3
D.4 Đáp án là: C.3 </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: 27 + 15 – 10 =..... Số điền vào chỗ chấm là:
A. 22
B. 32
C. 30
D. 12 Đáp án là: B. 32 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The traffic lights ______ to green, and the car drove on.
A. exchanged
B. turned
C. removed
D. shone Đáp án là: C. removed </s> | [
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<s> Chọn đáp án đúng với câu hỏi: A curriculum that ignores ethnic tensions, racial antagonisms, cultural _____ and religiousdifferences is not relevant.
A. contacts
B. barriers
C. diversity
D. levels Đáp án là: C. diversity </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Điểm nào dưới đây thuộc đồ thị hàm số y = 5x – 3?
A. (1; 3);
B. (2; 4);
C. (3; 3);
D. (1; 2). Đáp án là: D. (1; 2) </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một dây dẫn có dạng hình trụ, tiết diện dều được làm bằng nhôm. Ban đầu dây có điện trở là 12 Ω. Khi dây được gấp làm đôi thì điện trở của nó khi đó là:
A. 3 Ω.
B. 6 Ω.
C. 12 Ω.
D. 24 Ω. Đáp án là: A. 3 Ω. </s> | [
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1... |
<s> Chọn đáp án đúng với câu hỏi: Cho chiết suất của nước bằng 4/3, của benzen bằng 1,5, của thủy tinh flin là 1,8. Có thể xảy ra hiện tượng phản xạ toàn phần khi chiếu ánh sáng từ
A. từ benzen vào nước.
B. từ nước vào thủy tinh flin.
C. từ benzen vào thủy tinh flin.
D. từ chân không vào thủy tinh flin Đáp án là: A. từ benzen vào nước. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn câu đúng:
A. Cơ thể người là một vật cách điện
B. Cơ thể người là một vật dẫn điện
C. Cơ thể người là không chịu ảnh hưởng của dòng điện
D. Cơ thể người là không gặp nguy hiểm khi có dòng điện chạy qua Đáp án là: B. Cơ thể người là một vật dẫn điện </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The man wanted to get some fresh air so he opened the window.
A. The man wanted to get some fresh air but he opened the window.
B. The man opened the window in order to get some fresh air.
C. Though he man wanted to get some fresh air, he opened the window.
D. The man opened the window so that he wanted to get some fresh air. Đáp án là: B. The man opened the window in order to get some fresh air. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chiều đi của máu trong cơ thể là?
A. Tâm nhĩ => tâm thất => động mạch
B. Tâm nhĩ => tâm thất => tĩnh mạch
C. Tâm thất => tâm nhĩ => động mạch
D. Tâm thất => tâm nhĩ => tĩnh mạch Đáp án là: A. Tâm nhĩ => tâm thất => động mạch </s> | [
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<s> Chọn đáp án đúng với câu hỏi: What often performs work, such as printing or checking for arriving messages on an electronic mail network?
A. Program execution
B. Foreground processing
C. Microprocessor
D. A background process Đáp án là: D. A background process </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong một ống dòng nằm ngang thì:
A. tổng áp suất tĩnh và áp suất động tại một điểm bất kì luôn là một hằng số.
B. tổng áp suất tĩnh và áp suất động tại một điểm bất kì luôn dương.
C. áp suất tĩnh và áp suất động tại một điểm luôn thay đổi
D. áp suất tĩnh và áp suất động tại một điểm bất kì luôn bằng nhau. Đáp án là: A. tổng áp suất tĩnh và áp suất động tại một điểm bất kì luôn là một hằng số. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: trong quá trình tiến hóa nhân tố làm thay đổi tần số alen của quần thể chậm nhất là
A. Đột biến
B. Các yếu tố ngẫu nhiên
C. Chọn lọc tự nhiên
D. di – nhập gen Đáp án là: A. Đột biến </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Mác Tuên là nhà văn lớn của Mĩ vào
A. thế kỉ XVI - đầu thế kỉ XVII
B. thế kỉ XVII - đầu thế kỉ XVIII
C. thế kỉ XVIII - đầu thế kỉ XIX
D. thế kỉ XIX - đầu thế kỉ XX Đáp án là: D. thế kỉ XIX - đầu thế kỉ XX </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Theo quan điểm tiến hóa hiện đại, có bao nhiêu phát biểu dưới đây là đúng về chọn lọc tự nhiên? I. Chọn lọc tự nhiên làm xuất hiện các alen mới và các kiểu gen mới trong quần thể. II. Chọn lọc tự nhiên khó có thể loại bỏ hoàn toàn một alen lặn có hại ra khỏi quần thể. III. Chọn lọc tự nhiên chống lại alen trội có thể nhanh chóng làm thay đổi tần số alen của quần thể. IV. Chọn lọc tự nhiên phân hóa khả năng sống sót của các alen khác nhau trong quần thể theo hướng thích nghi với con người.
A. 4
B. 3
C. 2
D. 5 Đáp án là: C. 2 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Even if the job market is not stable, those who persist will be able to land jobs eventually.
A. When it’s hard to find a job, jobs on land are even harder.
B. Patient people wil secure jobs even in an instable job market.
C. Only persistent job seekers can find jobs.
D. In land jobs are only available to persistent jobs applicants. Đáp án là: A. When it’s hard to find a job, jobs on land are even harder. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong hiện tượng quang điện ngoài, khi có ánh sáng thích hợp chiếu vào catốt của tế bào quang điện thì êlectron sẽ:
A. Bị bật ra khỏi catốt.
B. Phá vỡ liên kết để trở thành êlectron dẫn.
C. Chuyển động mạnh hơn.
D. Chuyển lên quỹ đạo có bán kính lớn hơn. Đáp án là: A. Bị bật ra khỏi catốt. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số đảo nhỏ ở đất nước Nhật Bản là
A. hàng chục
B. hàng trăm
C. hàng nghìn
D. hàng chục nghìn Đáp án là: C. hàng nghìn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Số trung bình cộng của 2,4 ; 2,7 ; 3,5 và 3,8 là :
A. 12,4
B. 6,2
C. 3,1
D. 3,5 Đáp án là: C. 3,1 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Cho 12 gam Mg tác dụng với dung dịch HNO 3 vừa đủ thu được dung dịch A và V lít hỗn hợp khí (đktc) gồm N 2 O và N 2 có tỉ khối so với H 2 bằng 18. Cô cạn cẩn thận toàn bộ dung dịch A thu được 75 gam muối khan. Giá trị của V là:
A. 2,48
B. 2,016
C. 2,24
D. 2,688 Đáp án là: C. 2,24 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Choose the letter A, B, C or D the word that has different stress pattern from others.
A. perform
B. export
C. bamboo
D. teammate Đáp án là: D. teammate </s> | [
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<s> Chọn đáp án đúng với câu hỏi: This programme is very useful for children ______ from mental health problems.
A. suffering
B. suffer
C. suffered
D. are suffering Đáp án là: A. suffering </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Việc Liên Xô chế tạo thành công bom nguyên tử (năm 1949) có ý nghĩa như thế nào?
A. phá vỡ thế độc quyền bom nguyên tử của Mĩ
B. đánh dấu bước phát triển về mọi mặt của Liên Xô.
C. Liên Xô giành quyền ưu thế về vũ khí hạt nhân với Mĩ.
D. tạo ra thế cân bằng về sức mạnh hạt nhân giữa Liên Xô và Mĩ. Đáp án là: A. phá vỡ thế độc quyền bom nguyên tử của Mĩ </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Kẻ thù cụ thể trước mắt của nhân dân Đông Dương trong những năm 1936 – 1939 là
A. thực dân Pháp xâm lược.
B. bọn phản động thuộc địa và tay sai.
C. địa chủ phong kiến.
D. tư sản mại bản. Đáp án là: B. bọn phản động thuộc địa và tay sai. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Chọn phát biểu sai : Lực tác dụng vào chất điểm dao động điều hoà
A. Có biểu thức F = -kx.
B. Có độ lớn không đổi theo thời gian.
C. Luôn hướng về vị trí cân bằng.
D. Biến thiên điều hoà theo thời gian. Đáp án là: B. Có độ lớn không đổi theo thời gian. </s> | [
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29886,
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1715,
29871,
30128,
30030,
865,
325,
31280,
29875,
274,
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298,
228,
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29875,
29901,
14542,
31214,
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1374,
29874,
30103,
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289,
347,
31500,
207,... | [
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<s> Chọn đáp án đúng với câu hỏi: Almost all the 50 or so different kinds of modern plastic are made from oil, gas or coal-non-renewable natural (72) __________
A. processes
B. resources
C. products
D. fuels Đáp án là: A. processes </s> | [
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<s> Chọn đáp án đúng với câu hỏi: ______ are where farmers often grow rice
A. Rice paddies
B. Paddy fields
C. Crops
D. A&B are correct Đáp án là: D. A&B are correct </s> | [
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<s> Chọn đáp án đúng với câu hỏi: The speech is being hailed as a milestone in race relations.
A. signs
B. achievements
C. landmarks
D. progresses Đáp án là: C. landmarks </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Hỗn hợp X gồm một số amino axit (chỉ có nhóm chức –COOH và – N H 2, không có nhóm chức khác). Trong hỗn hợp X, tỉ lệ khối lượng của oxi và nito tương ứng là 64:21. Để tác dụng vừa đủ với 14,15 gam hỗn hợp X cần 100ml dung dịch HCl 1,5M. Mặt khác đốt cháy hoàn toàn 14,15 gam hỗn hợp X cần V lít khí O 2 (đktc) thu được H 2 O, N 2 và 17,6 gam C O 2. Giá trị V là:
A. 8,42
B. 9,24
C. 9,52
D. 8,68 Đáp án là: C. 9,52 </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Why are gas prices going up________than analysts expected?
A. fast
B. fastly
C. faster
D. more fastly Đáp án là: C. faster </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Trong máy quang phổ lăng kính, lăng kính có tác dụng
A. tăng cường độ chùm sáng
B. tán sắc ánh sáng
C. nhiễu xạ ánh sáng
D. giao thoa ánh sáng Đáp án là: B. tán sắc ánh sáng </s> | [
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<s> Chọn đáp án đúng với câu hỏi: When you are an old age pensioner, you have to learn to............ a very small income.
A. live on
B. live up to
C. live out
D. live down Đáp án là: A. live on </s> | [
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<s> Chọn đáp án đúng với câu hỏi: -Jack: “I’m going to take a five-day trip to Rome.” -Jill: “______”.
A. No, of course not.
B. Have a good time.
C. The same to you.
D. Yes, let’s. Đáp án là: B. Have a good time. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Ở đâu xuất hiện điện từ trường?
A. Xung quanh một điện tích đứng yên
B. Xung quanh một dòng điện không đổi
C. Xung quanh một tụ điện đã tích điện và được ngắt khỏi nguồn
D. Xung quanh chỗ có tia lửa điện Đáp án là: D. Xung quanh chỗ có tia lửa điện </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Máy sấy tay cảm ứng được lắp trong nhà vệ sinh của các nhà hàng, khách sạn, rạp chiếu phim,... Khi người sử dụng đưa tay vào vùng cảm ứng, máy sẽ tự động sấy để làm khô tay và ngưng sấy khi người sử dụng đưa tay ra. Máy sấy tay này hoạt động dựa trên
A. cảm ứng độ ấm của bàn tay.
B. cảm ứng tia tử ngoại phát ra từ bàn tay.
C. cảm ứng tia X phát ra từ bàn tay.
D. cảm ứng tia hồng ngoại phát ra từ bàn tay. Đáp án là: D. cảm ứng tia hồng ngoại phát ra từ bàn tay </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Một kho có 32 tấn hạt tiêu. Người chủ kho đã bán đi 1/4 số hạt tiêu có trong kho, sau đó nhập vào thêm 2215/7 tấn hạt tiêu nữa, cuối cùng đã bã bán đi một nửa số hạt tiêu có trong kho. Số hạt tiêu còn lại trong kho là:
A. 337/14 tấn
B. 339/14 tấn
C. 337/14tạ
D. 333/14 tạ Đáp án là: A. 337/14 tấn </s> | [
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<s> Chọn đáp án đúng với câu hỏi: Thể tích ancol etylic 92 o cần dùng là bao nhiêu để điều chế được 2,24 lít C 2 H 4 (đktc). Cho biết hiệu suất phản ứng đạt 62,5% và d = 0,8 g/ml.
A. 8 ml.
B. 10 ml.
C. 12,5ml.
D. 3,9 ml. Đáp án là: B. 10 ml. </s> | [
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<s> Chọn đáp án đúng với câu hỏi: According to the passage, how many subspecies of giraffe are there?
A. three
B. nine
C. five
D. seven Đáp án là: B. nine </s> | [
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1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Lựa chọn đáp án đúng nhấtTìm x để biểu thức √(4/(−7+x)) có nghĩa
A. x≤7
B. x≥7
C. x > 7
D. x < 7 Đáp án là: C. x > 7 </s> | [
1,
1,
29871,
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30975,
29876,
29871,
30128,
29976,
29886,
29871,
1715,
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865,
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29875,
29901,
365,
31874,
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521,
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29876,
29871,
30128,
29976,
29886,
298... | [
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
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1,
1,
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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,
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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... |
<s> Chọn đáp án đúng với câu hỏi: Chiếu một chùm sáng song song tới một chiếc gương. Chùm tia phản xạ ngay khi vừa rời gương là chùm tia hội tụ. Có thể xác định được đó là gương gì hay không?
A. Gương phẳng
B. Gương cầu lồi
C. Gương cầu lõm
D. Không thể xác định được Đáp án là: C. Gương cầu lõm </s> | [
1,
1,
29871,
678,
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29871,
30128,
29976,
29886,
29871,
1715,
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30030,
865,
325,
31280,
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274,
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298,
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29875,
29901,
678,
347,
31500,
30103,
29884,
2730,
31214,
31500,
29873,
521,
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1,
1,
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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... |
<s> Chọn đáp án đúng với câu hỏi: Phương trình chuyển động của chuyển động thẳng chậm dần đều là
A. s = v 0 t + 0, 5. a t 2 (a và v 0 cùng dấu).
B. x = x 0 + v 0 t + 0, 5. a t 2 (a và v 0 cùng dấu).
C. s = v 0 t + 0, 5. a t 2 (a và v 0 trái dấu).
D. x = x 0 + v 0 t + 0, 5. a t 2 (a và v 0 trái dấu). Đáp án là: D. x = x 0 + v 0 t + 0, 5 </s> | [
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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: Việc phân chia thuộc địa giữa các nước đế quốc ở châu Phi căn bản hoàn thành vào thời gian nào?
A. Đầu thế kỉ XX
B. Cuối thế kỉ XIX
C. Giữa thế kỉ XIX
D. Giữa thế kỉ XX. Đáp án là: A. Đầu thế kỉ XX </s> | [
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1374,
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31500,
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521,
423,
266,... | [
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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: Cuộn sơ cấp của máy biến thế có 1200 vòng, cuộn thứ cấp 60 vòng, khi đặt vào hai đầu cuộn sơ cấp một hiệu điện thế xoay chiều 220 V thì ở hai đầu cuộn thứ cấp có hiệu điện thế là
A. 9 V.
B. 11 V.
C. 22 V.
D. 12 V. Đáp án là: B. 11 V. </s> | [
1,
1,
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274,
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29875,
29901,
10406,
29877,
31214,
31500,
29876,
577,
207,
158,
5777,
31500,
30103,... | [
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1,
1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Some of them have no privacy: their parents read all their emails, and enter their rooms (3) knocking.
A. in
B. during
C. without
D. within Đáp án là: C. without </s> | [
1,
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29976,
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29901,
3834,
310,
963,
505,
694,
5999,
4135,
29901,
1009,
11825,
1303,
599... | [
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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: Căn cứ vào Atlat Địa lí Việt Nam trang 22, cho biết các trung tâm công nghiệp chế biến lương thực, thực phẩm nào sau đây có quy mô rất lớn?
A. Hà Nội, TP. Hồ Chí Minh.
B. Hải Phòng, Cần Thơ.
C. Cần Thơ, Hà Nội.
D. TP. Hồ Chí Minh, Hải Phòng. Đáp án là: A. Hà Nội, TP. Hồ Chí Minh. </s> | [
1,
1,
29871,
678,
30975,
29876,
29871,
30128,
29976,
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1715,
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30030,
865,
325,
31280,
29875,
274,
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298,
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29901,
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207,
137,
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2723,
207,
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2947,
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29877,
2... | [
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1,
1,
1,
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: I sat down _______ drank my coffee.
A. and
B. but
C. so
D. therefore Đáp án là: A. and </s> | [
1,
1,
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678,
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29871,
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29976,
29886,
29871,
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865,
325,
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274,
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298,
228,
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29901,
306,
3290,
1623,
903,
7652,
1649,
270,
10003,
590,
26935,
29889,
13... | [
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1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1,
1... |
<s> Chọn đáp án đúng với câu hỏi: Có thể điều chế Na, Mg, Ca bằng cách nào sau đây?
A. Dùng H 2 khử các oxit kim loại tương ứng
B. Điện phân nóng chảy muối clorua.
C. Điện phân dung dịch muối clorua bão hoà.
D. Dùng kali khử dd muối clorua Đáp án là: B. Điện phân nóng chảy muối clorua. </s> | [
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29871,
30128,
29976,
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1715,
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30712,
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1... |
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