user-avatar
nguyenthibinhthuan28
2 năm trước
Bài 1: Máy cơ đơn giản: A. làm thay đổi phương của trọng lực tác dụng lên vật. B. giúp con người làm việc có nhanh hơn. C. giúp con người kéo vật lên với lực kéo lớn hơn trọng lượng của vật. D. giúp con người nâng vật nặng lên cao dễ dàng hơn. Bài 4: Máy cơ đơn giản nào sau đây không thể làm thay đổi đồng thời cả độ lớn và hướng của lực? A. Ròng rọc cố định. B. Ròng rọc động. C. Mặt phẳng nghiêng. D. Đòn bẩy.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1. A football match often _________ 90 minutes A. lasts B. has C. rings D. gets 2. My mum _______________ me a computer last year A. buys B. doesn’t buy C. bought D. buying 3. …………. did Ba do at the weekend? -He studied English. A. What B. Where C. Why D. How 4. Please_____________with fire. A. playing B. play C. to play D. Don’t play 5. Did you buy a lot of souvenirs in Hanoi, Nga? A. I bought a lot of souvenirs in Hanoi. B. I did C. Yes, I bought D. Yes, I did 6. They prefer going fishing to …………jogging in the park every day. A. go B. to go C. going D. went 7. Ha Noi is very polluted now. I wish it ……..more fresh air to make our health better A. have B. had C. has D. has had 8. He would rather _______ have bread than soup for breakfast. A. to have B. has C. have D. had 9. My father doesn’t want …. coffee, but he does drink tea. A. to drink B. drink C. drank D. drinking 10. The speed limit on this highway is 65 miles an hour. I would rather you ……………more slowly A. drive B. driven C. drove D. driving 11. My father comes home from work at five o’clock in ……….afternoon. A. the B. an C. a D. Ø 12. When I was a little boy, my parents usually …………… for me in the evening. A. read B. readed C. to read D. reading 13. We’re wasting a lot of time doing useless things. It’s time we _______ something better for our project. A. to do B. did C. done D. do 14. Could you tell me when _______ next flight to New York is? A. this B. the C. a D. Ø 15. She is talking as though she …………..everything about the subject. A. knew B. know C. known D. to know

Change the following sentences into the passive. (Chuyển các câu sau sang bị động) 1. People grow rice in many countries in the world. -> Rice 2. Graham Bell invented the telephone many years ago. -> The telephone 3. They have used this car for many years. -> This car 4. Lan practices English every day. -> English 14:54 M 59% 5. They will take the garbage out of the city. -> The garbage 6. Mary sent me this letter two days ago. ->I 7. People make compost from vegetables. -> Compost 8. You must finish this work before Sunday. -> This work 9. She hasn't used this bicycle for a long time. -> This bicycle 10. I saw a strange man in my garden yesterday. -> A strange man 11. They clean the floor every morning. -> The floor 12. They will solve the problem soon. ->The problem 13. They break the glass into small pieces. -> The glass 15. They made these cars in the USA. -> These cars 16. People have used the Internet all over the world. -> The Internet 17. We planted many trees in the school garden. -> Many trees 18. Someone has taken my book away. -> My book 19. He didn't help me with my homework. ->I 20. We have learnt English for three years. -> English 21. My father often reads books before bedtime. -> Books 22. Lan bought some comic books for her brother. -> Some comic books 23. My sister received a letter yesterday. -> A letter 24. She can solve the problem in just 2 minutes. -> The problem 25. Nowadays people use electricity for lighting. -> Electricity

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team