單項(xiàng)選擇題A centrifugal pump can’t supply water after startingYou should check （）.
A.priming water
B.power supply
C.packing gland
D.bearing lubrication
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1.單項(xiàng)選擇題Open the （）of inter cooler before starting an air compressor.
A.cylinder cover
B.cooling water
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D.drain valve
2.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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