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hoà n toà n thu Äược khà H2 . Dẫn toà n bá» lượng H2 sinh ra Äi qua á»ng Äá»±ng 8 gam CuO nung nóng, sau má»t thá»i gian. thấy trong á»ng còn lại 6,72 gam chất rắn ...
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A. woke B. wake C. awake D. waken. 41. This is not big enough to cut down a tree. A. axe B. hammer C. screw D. knife. 42. In the market, the merchants and joked with their friends and neighbours. A. bargained B. gardened C. bearded D. changed. 43. He