單項(xiàng)選擇題During working of an air compressor, （） should be drained.
A.oil sump
B.oil separator
C.outlet pipe
D.inlet pipe
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1.單項(xiàng)選擇題During working of an air compressor, （） should be drained.
A.inter cooler
B.cylinder
C.outlet pipe
D.inlet pipe
2.單項(xiàng)選擇題Before starting an air compressor, It should be （）.
A.unloaded
B.primed
C.filled with water
D.greased
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