单项选择题

Before starting an air compressor, It should be （）.

A.turned
B.oil level checked
C.filled with water
D.A and B

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单项选择题

A.engine cylinder
B.air bottle
C.evaporator
D.condenser

单项选择题

A.expansion tank
B.combustion chamber
C.air receiver
D.evaporator

单项选择题

A.air cylinder
B.combustion chamber
C.steam drum
D.expansion tank