Giải thích vì sao phải có thêm công tắc 2 cực trong mạch MỘT CÔNG TẮC BA CỰC ĐIỀU KHIỂN HAI ĐÈN?

viết lại câu: They have a great interest in artificial intelligence. They are .....

viết đoạn văn từ 7-9 câu nói về tầm quan trọng của sách đối với em . trong đoạn văn có dùng ít nhất 1 câu bị động

tìm tất cả các số tự nhiên có 4 chữ số sao cho mỗi số đều là số chính phương,lập phương

Giúp mình với ạ! Mình cần gấp ạ

1. He fell down when he …………towards the church. A. run B. runs C. was running D. had run 2. The train …………. half an hour ago. A. has been leaving B. left C. has left D. had left 3. He has been selling motorcycles…………….. A. ten years ago B. since ten years C. for ten years ago D. for ten years. 4. I ……..Texas State University now. A. am attending B. attend C. was attending D. attended. 5. The little girl asked what ……… to her friend. A. has happened B. Happened C. had happened D. would have been happened. 6. John ……… a book when I saw him. A. is reading B. read C. was reading D. Reading 7. I………….to New York three times this year. A. have been B. was C. were D. had been 8. I will come and see you before I………….for America. A. leave B. will leave C. have left D. shall leave 9. I have never played badminton before. This is the first time I ……… to play. A. try B. tried C. have tried D. am trying 10. He will take the dog out for a walk as soon as he ……….. dinner. A. finish B. finishes C. will finish D. finishing 11. When I met him , he ……. as a waiter for a year. A.had been working B. worked C. have worked D. work. 12. I………….the dishwasher on when heard the shot. A. am turning B. were turning C. was turning D. turned 13. There was a time when watching TV really……………family entertainment. A. were B. was C. had been D. Is 14. The Olympic Games…………every four years. A. take place B. takes place C. took place D. is taking place. 15. …………….you go to the dentist? A. how often are B. how often do C. how often does D. how are

2,3 x 4,5 + 2,3 x 2,5 + 3 x 2,3

Cảm ơn nhiều Give the correct form of the verbs. 1.The whole machine would fall to pieces if you (remove).............. that screw. 2.I (keep) ............. a horse if I could afford it. 3.I’d go and see him more often if he (live).......... on a bus route. 4.If they (ban)........... the sale of alcohol at football matches, there might be less violence. 5.I (offer).................. to help if I thought I’d be any use. 6.What would you do if the lift (get)..................stuck between two floors? 7.If you (paint).................the walls white, the room would be much brighter. 8.If you (change).....................your job, would it affect your pension? 9.If you knew you had only six weeks to live, how you (spend)............... those six weeks? 10.I’d climb over the wall if there (not be).................. so much broken glass on top of it.

Ròng rọc kép gồm hai ròng rọc có đường kính khác nhau được gắn với nhau. Em hãy quan sát sơ đồ sau và nêu rõ: a) Tác dụng của ròng rọc kép. b) Ròng rọc này tương đương với ròng rọc nào mà em đã học? Xin cảm ơn

viết một đoạn văn ngắn về tình cảm gia đình, trong đó có khởi ngữ và thành phần biệt lập