Cần phải dùng 200ml dung dịch HCl để kết tủa hoàn toàn 200g dung dịch AgNO3 8,5%. Tính nồng độ mol của dung dịch HCl
Give the correct form of the word given in the present perfect: Nhung: ________ you ever _______ (eat) a Philadephia cheesesteak? Nora: Yes, I have. Nhung: Really? __________ you ______ (be) to Philadelphia? Nora: Yes, I ________ (be) there twice. I ___________ (visit) many famous places in the city. Nhung: ________ you _________ (visit) the Constitution Center? Nora: No, I haven't, but I __________ (see) the Liberty Bell. Look at this postcard.
Chia từ thik hợp Mng giúp e với ạ E cảm ơn
e lại cần sự trợ giúp nx các thánh tiếng anh 1. This house __________ in 1970 by my grandfather. * 1 điểm a) Built b) Was built c) Was build d) Has built 2. The robbers ————————- by the police. * 1 điểm a) Have arrested b) Have been arrested c) Was arrested d) Had arrested 3. We ———————- for the examination now. 1 điểm a) Have preparing b) Are preparing c) Had preparing d) Have been prepared 4. It ——————— since yesterday. 1 điểm a) Is raining b) Has been raining c) Have been raining d) Was raining 5. This machine ————————- for five hours. 1 điểm a) Have been working b) Has been worked c) Was working d) Am working 6. The students ———————- to submit their reports since this week. * 1 điểm a) Have asked b) Are asked c) Has asked d) Are asking 7. As the patient could not walk he ———————– home in a wheelchair. 1 điểm a) Has carried b) Has been carried c) Was carried d) Was carrying 8. The students ——————— for lying by the teacher. 1 điểm a) Have been punished b) Punished c) Is punished d) Was punished 9. I ——————— to become a successful writer. 1 điểm a) always want b) Am alwys wanted c) Was always wanted d) Am always wanting 10. The injured people ———————- to the hospital in an ambulance. 1 điểm a) Were taking b) Was taking c) Were taken d) Have taken
Hãy nêu mục đích của việc mắc dây đai song song và dây đai mắc chéo nhau? Giúp e với ạ
Cảm nhận của em về vẻ đẹp người anh hùng Lê Lợi Nguyễn Trãi dược thể hiện qua bài cáo Bình Ngô Đại Cáo
1. By the end this month, they (be) in HaNoi for 1 month. → 2. By December, we (learn) English for 6 years. → 3. By the end of this week, they (marry) for 2 years. → 4. We (finish) this work in 3 days. → 5. By the time they arrive at the village, all the villagers (leave) for another valley. 6. By the time he gets to the airport, the plane (take) off. → 7. When we go to our class, the lesson (start) for 15 minutes. → 8. I know before they come to my house, I (go) out for a walk. → 9. We have got 2 hours. We (do) all the house work by the time your parents arrive. 10. These machines (work) very well when they get their first service next month. → 11. By the time we find them on the mountain, they (suffer) from coldness and hunger for 6 hours. → 12. By this time tomorrow they (visit) Paris for the first time. → 13. Tom is a first year student. By the end of next year, he (learn) chemistry for 3 years→ 14. By 2010, the number of schools in our country (double). → 15. In twelve month’s time, the average income of our people in our country (rise) 5 percent, while inflation (not rise) at all. → 16. I hope they (repair) the road which leads to Huong Vy and Dong Son commune by the time we come back next summer. → 17. Roy can’t ski better. I know by the end of this month, he (have) lessons for a full month. → 18. By the time you arrive, I (write) the essay. → 19. By the year 2012 many people (lose) their jobs. → 20. By 5:30 p.m, we (sit) here for 3 hours. → 21. In 10 more minutes, they (wait) for him for 2 hours. → 22. Before he graduates from his university, he (stay) in HaNoi city for 4 years. → 23. When she retires, he (work) for this factory for 30 years. → 24. By the time we get to the nearest city, we (drive) for 5 days. →
Cho hàm số (C): y=x3−3x2 . a) Viết phương trình tiếp tuyến của đồ thị (C) tại điểm M(1,-2). b) Chứng minh rằng các tiếp tuyến khác của đồ thị (C) không đi qua M. Giải chi tiết câu b hộ em vs câu a e làm đc rồi
co hai thung nuoc mam thung to dung nhieu hon thung nho 4,8l neu giot bot o thung nho ra 3,77l thi thung nho con lai la 8,3l hoi luc dau moi thung dung duoc bao nhieu lit nuoc mam
Một hình chữ nhật có chiều dài 80cm và có nửa chu vi bằng chu vi hình vuông có cạnh 26cm . Tính chiều rộng hình chữ nhật .
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