user-avatar
truongvanphulwine
2 năm trước
Trong sản xuất nông nghiệp cần nhiều phân đạm, phân đạm điều điều chế từ nitrogen của không khí. Trong không khí có hai thành phần chủ yếu là nitrogen và oxygen. Nitrogen lỏng sôi ở -196 oC, còn oxygen lỏng sôi ở -183 oC. Để tách hai khí ra khỏi nhau, chọn phương án nào trong các phương án sau đây.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Choose the best option to complete these following sentences 1. If you got a headache, why don’t you try ______an aspirin? A. to take B. taking C. to be taken D. being taken 2. I don’t like using the internet because it has some _____ A. benefits B. advantages C. limitations D. disadvantages 3. Cathy has three jobs, so she has a high _____ A. income B. fee C. bill D. money 4. The ______tell us what is happening in our city, in our country and in the world A. communication B. advertisements C. media D. forecasts 5. You should watch the news every day. It’s very _____ A. informative B. time-consuming C. costly D. boring 6. No one can ____the advantages of using the computers. They help us do our work quickly and efficiently A. refuse B. deny C. agree D. accept 7. Most children enjoy _________advertisements on TV A. to watch B. watch C. to watching D. watching 8. Do you think too much time is spent ______the internet? A. to use B. for use C. to using D. using 9. The first color TV pictures ______in 1928 A. produced B. were produced C. is produced D. produce 10. The first printed newspaper ______in China A. appeared B. was appeared C. has appeared D. is appeared 11. Our lives ______since the internet was invented A. improve B. improved C. have improved D. are improving 12. I lived deep in the country, without easy access _____media facilities A. to B. toward C. for D. in 13. Email can be sent and received at any hour of the day,_____? A. can they B. can’t it C. can it D. can’t they 14. Everyone has read the lasted news on the website, _____? A. hasn’t he B. haven’t they C. don’t they D. doesn’t he 15. You must look up the web pages. The information on them is _____ A. used B. useless C. useful D. unused 16. Internet users said that the internet offers a wide variety of choices in _____ A. entertain B. entertaining C. entertainingly D. entertainment 17. They shouted the latest news as they _____ A. walked B. are walking C. were walking D. was walking 18. People love _____newspapers and magazines A. to read B. reading C. read D. have read 19. The Kien Thuc Ngay Nay is _____ read by both teenagers and adults A. wide B. widely C. widen D. widing 20. People can get _____ from the Internet A. inform B. informative C. informations D. information 21. T.V viewer are able _____ questions about the show A. ask B. to ask C. asking D. asked 22. Lan watched T.V lastnight , _____? A. doesn’t she B. did she C. didn’t she D. hasn’t she 23. Nobody does this , ________? A. do they B. does it C. doesn’t he D. don’t they 24. Don’t talk in class , __________? A. won’t they B. shall we C. do you D. will you 25. The Internet has _____developed and become a part of our life. A. increase B. increasing C. increasingly D. increased 26. What do you use the internet _____? A. to B. for C. of D. at 27. How much tim do you spend _____ the web a day? A. surfing B. surf C. to surf D. have surfed 28. I can also _____ with my friends and ralatives by e-mail or chatting A. speak B. tell C. communicate D. talked 29. The Internet is not only _____and costly but also dangerous because of virus A. consuming-time B. time-consuming C. timing-consum D. consume-timing 30. You should reduce the _____of water your family uses. A. everage B. height C. low D. amount

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