Một máy biến thế có số vòng cuộn sơ cấp là 2500 vòng, cuộn thứ cấp là 50000 vòng. Hiệu điện thế ở hai đầu cuộn thứ cấp là 25000V. a) Tính hiệu điện thế hai đầu cuộn sơ cấp. b) Điện trở đường dây tải điện là 150Ω, công suất cần truyền đi là 200kᴡ. Tính công suất hao phí trên đường dây truyền tải.

He said nothing because he didn’t want to make his mother angry. àIn order __________________________________________________________________.

Mn ơi giúp em bài tập làm văn lập dàn ý với bài trắc nghiệm toán nha

Nêu 10 phản ứng hóa học oxi tác dụng với hợp chất. VD: CH4 + 2O2 = CO2 + 2H2O

Mình yếu nhất phần này, mng có thể giải và gthich giúp mình với ạ

Tìm 1 điểm khác gốc tọa độ O mà đồ thị hàm số đi qua y=2x^2

Choose the best answer to complete each of the following sentences. 11. There are many ....... why it is important to have a hobby. A. answers B. reasons C. details D. facts 12. Will you _____ making models in the future? A. pick up B. look for C. take up D. find 13. Do you think that hobby is ______ and boring? A. easy B. difficult C. danger D. interesting 14. I love my sister’s paintings because she is very _____ in using colors. A. careless B. care C. creative D. imagine 21. Hoa likes music. She often …………. to music in late evenings. A. listen B. listening C. listens D. to listens 22. I enjoy …………. baminton after school. A. doing B. playing C. seeing D. going 23. Ann has a large …………. of stamps. A. collect B. collection C. collecting D. collections 24. How …………. you go to the library after school? A. often B. much C. many D. usually 25. My sister usually goes to the library with me. She likes___ comic books very much. A. read B. reading C. to read D. reads 26. In big cities, there are many kinds of _____ for young people. A. entertain B. entertains C. entertainment D. entertaining 27. What _____ does Minh like playing in his free time? A. activities B. sports C. things D. subjects 28. He goes swimming when he ______ free time. A. have B. is having C. has D. will have 29. My uncle likes ______ the vegetables we grow ourselves. A. to eat B. eat C. eats D. eating 30. My close friend draws very well. She will be a …………. artist one day. A. fame B. famous C. famously D. famed 31. We ________ swimming because it’s fun and good exercise. A. like B. are liking C. will like D. liked 32. My grandparents don’t like ________ in the city because it’s noisy and crowded. A. live B. lived C. living D. to living 33. Fire needs oxygen to burn. It ________ without oxygen. A. burn B. burns C. don’t burn D. doesn’t burn 34. How much time do you spend ________ the Internet per day? A. surf B. to surf C. surfing D. to be surfing 35.I don’t mind ________ a DVD, but I prefer ________ to the cinema. A. to watch - to go B. watching – go C. to watch – going D. watching – to go 36. _____ is her father's hobby. He likes going to the zoo to see beautiful parrots or canaries. A. Collecting birds B. Raising pets C. Bird-watching D. Arranging flowers 37. My mother loves ____ She usually grows vegetables and takes care of them when she has free time. A. cooking food B. gardening C. cycling D. eating fruits

Là cho em tất cả đề nha em ko muốn suy nghĩ

Write the second sentence so that it means the same as the first one 1.The rising temperature in the water destroys ecosystems(so)=> 7.We don't use more oil and coal.Pollution doesn't increase(If)=>

viết tập hợp các chữ cái sau trong cụm từ a khoa học