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
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1.單項(xiàng)選擇題Before starting an air compressor, It should be （）.
A.unloaded
B.primed
C.filled with water
D.greased
2.單項(xiàng)選擇題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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