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yenwin
2 năm trước
Một bình chứa khí ở 57°C, người ta nén khí trong xilanh bằng lực 2000N làm nhiệt độ khí giảm còn 17°C và pittong đi chuyển 20cm. Tính đọ biến thiên nội năng của khí. Biết m khí= 10g, c= 1,5.10^3 J/kg.K
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(III) verb form and tenses: 16. We should.................. Som charity events to help poor children (hold) 17. They ............ A lot of children now (have) 18. My father would like ..............some warm clothes (donate) 19. Yesterday, she ...............a famous singer to the party (invite). 20. i would like............toothbrushes for poor children ( donate) 21. My mother .....................Ha Noi two months ago (visit) 22. There ................enough places for all people (be) 23. We should................ The community (help) 24. Teacher were very happy ..................a fail in their school playground last week (hold). 25. They...............clother to charity now (donate) 26. The biggest effect of overpopulation in there ...................... Enough jobs (be,not) 27. Toby.....................a survey about population two days ago (make) 28. Who should we .................in our community? (Help) 29. How about..................... Old paper? ( recycle) 30. Are you interested in ....................old books for the poor children? (Donate). ( IV )Complete the sencond sentence so that it has a similar meaning to the first: 1. My sister will visit Ha Noi tomorrow. Ha Noi.............................. 2. Mr Lam doesn't have a computer. Mr lam wishes...................... 3. My father water the flowers every day The flowers.........................

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