作文。

题目：China's first man in space-Yang Liwei

要求：1. 至少写五句话以上。2. 语句通顺。

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下列实验基本操作不正确的是[ ]

A、倾倒液体         

B、滴加液体     

C、稀释浓硫酸         

D、读取液体体积