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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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Open the （）of inter cooler before starting an air compressor.

A.cylinder cover
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D.drain valve

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Open the （）before starting an air compressor.

A.unload valve
B.cooling water
C.oil cup
D.sump