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kmanchun
2 năm trước
Hòa tan hoàn toàn m gam hỗn hợp kim loại Na và Ba vào nước dư thu được dung dịch X và 6,72 lít H2 (đo ở đktc). Để trung hòa dung dịch X cần V lít dung dịch HC1 1M. Giá trị của V là
Thích Trả lời Chia sẻ

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Chọn thì thích hợp nhất để hoàn thành các câu sau: 6. Mary ______ dinner when her friend ______ at 6.30 yesterday. A. is having / calls B. was having / called C. had / called D. had / calling 7. Who ______ when I came? - Mrs. Brown. A. you were talking to B. were you talking to C. are you talking to D. you are talking to 8. He ______ ill for a long time before he ______ in 1990. A. had been / died B. has been / died C. is / dies D. was / had died 9. Wait here until I _______________you. A. call B. will call C. am going to call D. am calling 10. We ______ as soon as you have finished your work. A. will go B. go C. went D. have gone 11. While I ____________TV last night, a mouse ran across the room. A. was watching B. am watching C. watched D. watch 12. I ______ the book by the time you come tonight. A. will be finishing B. have finished C. will have finished D. finished

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