试题与答案

下列实验操作中正确的是( ) A.点燃除H2外的可燃气体也先检验气体纯度 B.碱

题型:选择题

题目:

下列实验操作中正确的是(  )

A.点燃除H2外的可燃气体也先检验气体纯度

B.碱液流到桌子上,先用水洗,后用稀醋的溶液中和

C.刚取用浓酸的胶头滴管,防止酸液滴到桌上,将尖嘴向上

D.称取5.0gNaOH固体时,托盘上必须先各放一只质量相同的小烧杯

答案:

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参考答案:传递转矩及防止零件与轴产生相对转动

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