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He has a big car?改为否定句 He____ ____a big car.___填什么?回答了加分、
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()of rice has been eaten already by the end of the day.是much
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Don't worry .All the children ______by the nurses.
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Zheng He has over 300 ships,___some were over 150 meters lon
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用可溶性硅盐酸与其他酸反应可制得硅酸.向2L一定物质的量浓度的Na2SiO3溶液中加入足量稀盐酸,生成234g硅酸.请计
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