单项选择题

S1的大蒸汽的功率是多少（）

A.1500
B．1600
C．1700
D．1800

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单项选择题

通过来判断空压机空气入口的积尘是否过多（）

A.安全阀
B．真空指示器
C．视油镜
D．电控箱

The PHM is another real-time sampler that has been developed and tested by NIOSH, approved for use in underground coal mines by MSHA, and reached commercial production.

答案： The PHM (Personal Dust Monitor) is another real-time sampler...