由乙炔、乙醛组成的混合气体，经测定，其中碳的质量分数为72%，_爱下问搜题

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问题选择题

由乙炔、乙醛组成的混合气体，经测定，其中碳的质量分数为72%，则混合气体中氧的质量分数为（　　）

A．32%

B．22.65%

C．19.56%

D．2.14%

答案

答案：C

填空题

完形填空。

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填空题

孔子的言论学说被他的弟子记录在______一书中，而老子的学说则被记录在________一书中。