单项选择题
Before starting a reciprocating, steam-driven pump that has been idle for a period of time, you should （）.
A.open the steam line mot valve
B.drain the steam cylinder
C.close the steam cylinder drains
D.open the liquid cylinder drains
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A.rudder will respond sluggishly
B.hydraulic rams will over-speed
C.sight glass will show bubbles
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If a refrigeration system were short of refrigerant, the condition would result in （）.
A.continuous running of the compressor
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Condensate must be drained from the intercooler and after-coolers of an air compressor because （）.
A.the cooling effect of the condensate reduces the compressors efficiency
B.a danger of explosion exists whenever water is present in a compressor
C.water causes erratic operation of pneumatic components
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