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2 năm trước
Một máy công suất 1500W, nâng một vật khối lượng 100kg lên độ cao 36m trong vòng 45 giây. Lấy $ g=10m/{ s ^ 2 } $ . Hiệu suất của máy là
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I. Choose the underlined word or phrase (marked A, B, C or D) in each sentence that needs correcting. 1. The exhaust exploitation of natural resources can result in the bad consequences for A B C D the environment. 2. We can avoid to waste clean water by some effective ways such as turning off A B C faucets carefully after using them. D 3. People can use wind or hydro power to convert from electricity. A B C D 4. They will be opening a clean power factory this time last month. A B C D 5. She cancels her flight to Japan at 9 p.m. tomorrow, so she will be flying at that time. A B C D 6. Some prestigious scientists will invite to the meeting tomorrow to find some A B C solutions to the environmental problems. D 7. Air pollution will be increased anymore when people apply clean energy resources in A B C D many fields of life. 8. Within ten years, people will be used less fossil fuel and more renewable energy. A B C D 9. Using solar energy instead fossil fuels can help reverse the effects of global warming. A B C D 10. Wind power is clean, abundant, widely available, and environmental friendly. A B C D sửa từng chữ sai hộ mình ạ ạ :))

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