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单项选择题
A.the low inertia
B.the high inertia
C.the low velocity
D.the high velocity
单项选择题
A.butterfly valve
B.globe valve
C.gate valve
D.non-return valve
单项选择题
A.overcooling
B.poor cooling
C.overloading
D.unloading
单项选择题
A.the discharge temperature low
B.the discharge temperature high
C.the discharge pressure rise
D.the inter-stage pressure low
单项选择题
A.the lubrication
B.the cooling
C.the moisture separation
D.the valves
单项选择题
A.without first cooling it
B.without first heating it
C.without first unloading it
D.without first loading it
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
