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- 6will your school be different in the future?
- 7Once you have made a promise ,you must carry it out.翻译
- 8已知:反应3A+2B=2C+D,A、B两物质完全反应时的质量比为3:4,若生成C和D共140g,则该反应消耗B的质量为( ) A.80g B.60g C.140g D.70g
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