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daohang6a
2 năm trước
mot thua ruong hinh chu nhat co chieu dai 65 m, vhieu rong 40 m. nguoi ta trong rau tren thua dat do , cu 100m vuong nguoi ta thu hoach duoc 45 kg rau .hoi tren ca thua dat do ,nguoi ta thu hoach duoc bao nhieu ta rau ? co so do
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11 Đốt cháy hoàn toàn 12,4 gam photpho trong bình chứa khí oxi. Photpho cháy mạnh với ngọn lửa sáng chói tạo ra khói trắng bám vào thành bình dưới dạng bột là điphotpho pentanoxit (P2 O5 ). Thể tích khí O2 (đktc) đã tham gia phản ứng là A: 4,48 lít. B: 6,72 lít. C: 8,96 lít. D: 11,2 lít. 12 Chất X tạo bởi nguyên tố Y (có hóa trị II) với nguyên tố oxi. Biết X nặng hơn phân tử hiđro 15 lần. Nguyên tố Y là A: Lưu huỳnh. B: Nitơ. C: Magie. D: Cacbon. 13 Khối lượng tính bằng gam của nguyên tử kẽm là A: 10,793.10-23 g. B: 65,000.10-23 g. C: 1,993.10-23 g. D: 129,519.10-23 g. 14 Đốt cháy hết 8 gam kim loại đồng trong khí oxi thu được 10 gam đồng (II) oxit. Khối lượng khí oxi tham gia phản ứng là A: 18,0 gam. B: 10,0 gam. C: 8,0 gam. D: 2,0 gam. 15 Thể tích của 0,5 mol khí CO2 (đo ở đktc) là A: 11,2 lít. B: 33,6 lít. C: 22,4 lít. D: 5,6 lít.

1. Geographically, Poland is in in the very center of Europe – we could say that it is in the __________ of Europe. A. body B. mind C. soul D. heart 2. She’s the type who can’t still on holiday and is always ___________ the move. A. in B. on C. at D. by 3. He didn’t speak a word of French when he first moved to France. He had to pick up the language from _________. A. scratch B. start C. blank D. beginning 4. A full scholarship to Harvard and you’ve worried about leaving your job? Get real! You’d be a fool to _____________ a chance like that. A. pass up B. brush up C. turn up D. cast up 5. We have been told that under no circumstances _____________ the telephone in the office for personal affairs. A. we could use B. may we use C. we use D. did we use 6. “___________________________” – “Yes, of course” A. You must help me this time. B. You couldn’t give me a hand, could you? C. You don’t need your help. D. You can give me a hand. 7. When posed with a complicated mathematical equation, some students seek the assistance of a teacher. What is the closet meaning of the underlined word? A. spaced B. informed C. solved D. presented 8. The patient was found to be suffering from ____________ injuries as a result of his fall. A. multifarious B. multipliable C. multiple D. multiplied 9. He had been working for more than 11 hours. He __________ be tired after such hard work. He __________ prefer to get some rest. A. must – may B. can – may C. may – may D. might – might 10. Yesterday while the children ___________ by the lake, one of them ____________ his ball and _____________ to get it out himself. A. were playing – dropped - tried B. was playing – dropped – tried C. had been playing – had dropped – tried D. played – dropped - tried

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