thi thì tự làm đi bạn

Câu 2:

- Cách li kim loại với môi trường.

- Dùng hợp kim chống gỉ(hợp kim inox)

- Dùng chất chống mòn(chất kìm hãm)

- Dùng phương pháp điện hoá

....

https://www.facebook.com/thaonguyen.huynh.77128261

có fb ko? kbn đi

a). Cường độ mức định của dòng điện chạy qua dây nung của nồi là:

                           P= U.I⇒I=\(\dfrac{P}{U}\)=\(\dfrac{528}{220}\)= 2,4A

b). Điện trở dây nung của nồi khi đang hoạt động bình thường là:

                                    R=\(\dfrac{U}{I}\)=\(\dfrac{220}{2,4}\)=91,67Ω

1. D

2. C

3. B

4. B

5. C

1. Sally said she didn't like chocolate.

2. Mary said she was planning to take a trip.

3. Tom said he had already eaten lunch.

4. Kate said he had called his doctor.

5. Mr. Rice said he was going to Chicago.

6. Eric said she would come to the meeting.

7. Jean said he couldn't afford to buy a new car.

8. Jessica said she might go to the library.

9. Ted said she had to finish her work.

10. Miss Young said she would talk to Professor Reed.

11. Alice said she was going to visit her aunt and uncle.

12. Jim said he was sleepy.

13. They said they had lunch in Lug's restaurant.

14. Susan said she was washing the car.

15. The little boy said he fell ill.

Jessica said she might go to the library

31. has to

32. sings

33. driving

34. were built

35. It's raining

36. watched

37. don't believe

38. I'm losed 

39. not expensive

1. to finish

2. running

3. to find out

4. embarrassed

5. to inform 

6. hadn't run out of

7. greet

8. was over/ had stoped

9. choice

10. I could

11. account

12. cooked

13. attendance

14. arrived/ probably will be raining 

15. had finished/ sat

16. will travel

17. will brings

18. makes

19. carve

20. peace

21. will leave