题目内容

It was thought ______.

A.of impossible
B.of as impossible
C.as impossible
D.up as impossible

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光气及光气化产品生产装置区域必须设置____监测及超限报警仪表，还应设置事故状态下能自启动紧急停车种应急破坏处理的自控仪表系统。

A. 氢气
B. 一氧化碳
C. 氯气
D. 光气

______ is money to him when he is dying.

A.what good
B.What the use
C.What's the good of
D.What's the point of

This will _____ a good opportunity for them to exchange their experience.

A. choose
B. seize
C. demand
D. provide

光气及光气化工艺防护措施包括呼吸系统防护和____，其他如工作现场禁止吸烟、进食和饮水等。

A. 眼睛防护
B. 身体防护
C. 手防护
D. 安全