生产过程中，工人吸入高浓度的（）可引起缺氧窒息而中毒。A、一_爱下问搜题

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问题多项选择题

生产过程中，工人吸入高浓度的（）可引起缺氧窒息而中毒。

A、一氧化碳

B、氨

C、汽油

D、硫化氢

E、氮

答案

参考答案：A, D

单项选择题

行人净空要求：净高要求为( )m，净宽要求为( )m。

A．2.2；0.75～1.0

B．2.0；0.85～1.0

C．2.2；0.85～1.0

D．2.0；0.75～1.0

填空题

用方框中适当的词填空。

even if , until , so that , even though , although

1. Say it loudly_______ we can hear you clearly.
2. He didn't go to bed_______ he finished the work.
3. He went on with the work_______ he was very tired.
4. _______ he knew he would be punished by doing so, he kept doing．
5. _______it is midnight, the scientists are busy with the experiment.