Trên hình vẽ mô tả một công tắc tự động ngắt mạch điện để đảm bảo an toàn. Hãy tìm hiểu hoạt động của công tắc này: a. Khi dòng điện chưa quá mạnh thì có gì xảy ra với NC điện, thanh sắt và tiếp điểm? b. Nếu dòng điện vượt quá mức cho phép thì sao? c. Sau đó làm tn để mạch lại có điện? Giúp mik vs!!!!!!!!!!

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III. Fill in the blank with the most suitable prepositions: 1. Liz went _____ Nha Trang ______ summer vacation. 2. What are you thinking ______? 3. Nam talked ____ his friends _____ his recent vacation. 4. They returned ____ Hanoi last week. 5. She made a blue dress ____ her daughter. 6. The cap has a picture of a dolphin ____ it. 7. After the holiday they returned to Hanoi ____ plane. 8. They arrived home ______ the evening. 9. My mother takes care ________ the family. 10. I smiled _____ the child and said “hello” 11. Milk is good _____ your health. 12. She is always worried ________ her children. 13. Most children are scared ______ seeing the dentist. 14. The dentist looked ____ my teeth. 15. Will they come _____ dinner tonight? 16. There was a wide collection ____ vegetables ____ the stall. 17. The bus stopped ___ the bus station. 18. She added a little salt ____ the spinach. 19. Hoa set the table _____ plates, bowls, chopsticks, spoons and glasses. 20. You should eat plenty ____ fruit and vegetables. 21. I like taking part ____ sports. 22. There was a walking competition ____ children last night. 23. The number _______ participants increases every week. 24. You should listen _____ the pool lifeguard. 25. I don’t have my pocket ____ me. 26. Are you aware _____ the time? 27. There is a play _____ the Youth Theater tonight. 28. Are you free _____ Monday? 29. We should wash our hands ______ meals. 30. Very few Vietnamese people had TV sets _____ 1960s. 31. The street is full of traffic from morning ____ night. 32. Some people gathered outside the house and watched TV _____ the window. 33. Don’t forget to brush your teeth ____ every meal. 34. I was at the seaside ____ my summer vacation. 35. We will meet _____ six o’clock ______ Monday evening. 36. You should brush your teeth _____ every meal. 37. Hoa usually talks about her day _________ dinner. 38. The burglar got into the house _____ the window. 39. She lived ________ America ____ 1966. 40. Remember to wash your hands ____ meals. 41. What is ____ TV today? 42. There aren’t many good programs ____ teenagers. 43. Ho Chi Minh died ____ Hanoi _____ 1969. 44. I’m really interested _______ history. 45. He was famous _______ the fairy tales 46. Their ages range ______ twenty _____ forty. 47. Charles Dicken was born ____ February 17th 1812 ___ a poor family. 48. Are you very good ____ English? 49. They do not depend ____ tourism to live. 50. The children are growing ____ fast.