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问题 单项选择题

排出带有压力的氢气、氧气或向储氢罐、发电机输送氢气时，应（）地打开设备上的阀门和节气门。

A.迅速

B.剧烈

C.果断

D.均匀缓慢

答案

参考答案：D

选择题
The crazy fans _____ patiently for two hours, and they would wait till YaoMing, the basketball star, arrived.

A. were waiting
B. had been waiting
C. had waited
D. would wait
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单项选择题

隧道通风按照风道的类型和通风的安装位置有三种通风方式，以下错误的一项是( )。

A．风管式通风

B．巷道式通风

C．风墙式通风

D．洞口式通风
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