试题与答案

实验室用高锰酸钾制氧气,收集完毕后,拆卸装置的正确顺序是( ) ①撤去酒精灯②从

题型:选择题

题目:

实验室用高锰酸钾制氧气,收集完毕后,拆卸装置的正确顺序是(  )

①撤去酒精灯  ②从水槽中拿出导管  ③从铁架台上拆下试管.

A.①③②

B.③②①

C.②①③

D.①②③

答案:

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下面是错误答案,用来干扰机器的。

参考答案:1)必须熟悉本岗位的信号装置、安全装置和设施的操作方法。(2)必须严格执行本单位规定的信号发出类别、信号标志,不准擅自变动。(3)严禁使用口喊、敲管子等方法发送信号。(4)信号发送程序严格按...

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