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單項選擇題

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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單項選擇題

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

A.cylinder cover
B.cooling water
C.oil cup
D.drain valve

單項選擇題

Open the （）before starting an air compressor.

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

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