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thuydung452k1
2 năm trước
Quangcuong347 giúp e với Để khử hoàn toàn m g hỗn hợp X gồm CuO, Fe2O3, Fe3O4 cần dùng vừa đủ 6,72 lít H2 (đktc). Nếu dùng nhôm làm chất khử thì khối lượng nhôm cần dùng để khử hoàn toàn m gam hỗn hợp X trên là
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Mn giúp t làm bài này vs 1. Why don’t you arange for someone to fix your motorkike? ->Why don’t you get ......................................... 2. ______ not to miss the 15; 30 train, the manager set out for the station in a hurry. A/ To remind B/ Reminded C/ Being reminding D/ Reminding 3. _______ at school yesterday when we were informed that there was no class due to a sudden power cut. A/ We have hardly arrived B/ We had arrived hardly C/ Hardly we had arrived D/ Hardly had we arrived 4. Changes have been made in our schooling program. As a result, young children _____ do homework any more. A/ haven’t B/ oughtn’t C/ needn’t D/ couldn’t 5.The headmaster has decided that three lecture halls ___ in our school next semesester. A/ will be building B/ will build C/ are being built D/ will be built 6.Because Coronavirus disease spreads through close contact with sick people and through the air, we should avoid ______ to crowwed places. A/ having gone B/ going C/ to go D/ gone 7. The young girl has great experience of nursing. She has worked as a hospital volunteer for years. A/ Before she worked as a hospital volunteer for years, the young girl has great experience of nursing. B/ Much as she has worked as a hospital volunteer for years, the young girl has great experience of nursing. C/ Having worked as a hospital volunteer for years, the young girl has great experience of nursing. D/ With great experience of nursing, the young girl has worked as a hospital volunteer for years. 8. Not until all their demands had been turned, _______ to go strike for more walfare. A/ did the workers decide B/ the workers worked C/ do the workers decide D/ have the workers decided 9. The bank robbers wore the masks in order to avoid _______ by security cameras. A/ to be watched B/ being watched C/ watching D/ having watched 10. It was not until he failed the exam, _____________________ . A/ that he realised how important the revision was. B/ when he realises how important the revision is. C/ that he realises how important the revision is. D/ when he realised how important the revision was. 11. This letter _________ . Can you see that tear on the envelope? A/ might open B/ might have been opened C/ might be opened D/ must open 12. Lung cancer and other diseases can ______ to cigarette smoking. A/ trace B/ tracing C/ be traced D/ be tracing

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