题目内容

本实验能否用氢氧化钠代替饱和碳酸钠溶液洗涤?

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蒸出的粗乙酸乙酯中主要有哪些杂质?如何除去?

The motor car brings more ________ __________ than it promises to solve.

The aircraft creates a ________ _______ for time-consuming ________ that we never dreamed of.

The _______ machine, contrary to our expectations, __________ the hours spent on washing and _______.

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