试题与答案

水在实验中有重要作用,下面实验中水的作用解释错误的是( ) ABCD实 验 内

题型:选择题

题目:

水在实验中有重要作用,下面实验中水的作用解释错误的是(  )

ABCD

仪器连接

硫的燃烧

检查气密性

准备过滤器

连接前用玻璃端蘸水,起润滑作用.瓶中的水起到防止实验时炸裂瓶底的作用.形成密闭系统,用于观察现象检查装置是否漏气.用胶头滴管滴少量水,让滤纸紧贴漏斗内壁.

A.A

B.B

C.C

D.D

答案:

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答案:D题目分析:考查交际用语:A.Take it easy别着急,放轻松B.Come on加油C.You’re welcome 不用谢, D.See you再见,句意:--我得回家了,爸爸妈妈一定再等我呢。--再见。选D点评:交际用语的考查...

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