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2 năm trước
Trong công nghiệp, người ta sản xuất rượu etylic bằng cách dẫn 4,48 lit khí Etylen C2H4 ( đktc) qua nước ( có pha H2SO4 đ, nhiệt độ) A. Vậy với 4,48 lit khí Etylen trên thì thu được bao nhiêu gam rượu. Biết hiệu suất phản ứng là 90% B. Người ta cho lượng rượu trên vào 30ml nước thì độ rượu là bao nhiêu? Biết khối lượng riêng của rượu là 0,8 g/ml giúp mình với các bạn
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Giúp mình với các bạn ơi 20. They said we couldn’t look at the house. (didn’t allow) ............................................................................................................................ 21. I went away, so he had to solve the problem. I left ............................................................................................................................ 22. It’s an eight –hour flight to the West Coast. It takes ............................................................................................................................ 23. “Why don’t you postpone your trip till the fall, Jim?” suggested Sarah. Sarah suggested ........................................................................................................................... 24. “You’d better not spend any more time in the sun, Kate” said Annie. Annie advised ............................................................................................................................ 25. Don’t tell anyone if we let you into the secret. Don’t tell anyone if you .................................................................................................................. 26. They used to sew every button on by hand. Every button ............................................................................................................................ 27. I prefer to go by myself. I would ............................................................................................................................ 28. The police think the man holding the hostages is heavily armed. The man holding ............................................................................................................................ 29. It’s a terrible pity I can’t go there with you. I wish ............................................................................................................................ 30. Even though the guerrillas were short of ammunition, they won the battle. Despite ............................................................................................................................ 31. The tourists were most impressed with the castle. The castle made ............................................................................................................................ 32. Although Tuan took a taxi, he still arrived late for the interview. In spite ............................................................................................................................ 33. We ought to leave the party now if we want to catch the last train. If we don’t ............................................................................................................................ 34. Jane eats very little so as not to put on weight. Jane eats very little because ............................................................................................................ 35. “Let’s go abroad for our holiday this year” said Mr Ba. Mr Ba suggested ............................................................................................................................

Bài 4: Điền giới từ thích hợp 1. Lan'll have a party ...................... Friday evening. 2. Would you like to come .......... my house ............lunch? 3. She takes care ............. her family. 4. She works .........a local supermarket. 5. My mother works...............the field............. my father. 6. Does your father work ............. . Hanoi? 7. David is good ................... . Math. 8. What do you do ............. your free time? 9. Are you interested ............. . sports?. 10. There's a good film ............. . ......... the moment. 11. Thanks .......... . your letter. 12. I'll see my mom and dad ................ . their farm. 13. We have to work hard .......... home and................ school 14. We'll visit her .......... Christmas. 15. Are you tired ............. . watching TV?

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