单项选择题X 纠错
A.without first cooling it
B.without first heating it
C.without first unloading it
D.without first loading it
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单项选择题
A.air
B.moisture
C.cooling water
D.lubricant
单项选择题
A.drained off
B.collected
C.sent to the crankcases
D.separated with oil
单项选择题
A.rotary compressors
B.reciprocating compressors
C.centrifugal compressors
D.screw compressors
单项选择题
A.starting diesel engines
B.pneumatic control systems
C.pneumatic tools
D.supercharging air
单项选择题
A.globe valves
B.butterfly valves
C.gate valves
D.reducing valves
