單項(xiàng)選擇題Open the （）before starting an air compressor.
A.unload valve
B.cooling water
C.oil cup
D.sump
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1.單項(xiàng)選擇題Supply the （）before starting an air compressor.
A.fuel oil
B.cooling water
C.steam
D.power
2.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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