A.the lubrication
B.the cooling
C.the moisture separation
D.the valves
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A.without first cooling it
B.without first heating it
C.without first unloading it
D.without first loading it
A.air
B.moisture
C.cooling water
D.lubricant
A.drained off
B.collected
C.sent to the crankcases
D.separated with oil
A.rotary compressors
B.reciprocating compressors
C.centrifugal compressors
D.screw compressors
A.starting diesel engines
B.pneumatic control systems
C.pneumatic tools
D.supercharging air
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