單項選擇題When starting a centrifugal pump, the discharge valve should be （）.
A.closed
B.opened fully
C.cracked open
D.partly open
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1.單項選擇題When start a screw pump, the by pass valve should be （）.
A.closed
B.opened fully
C.cracked open
D.partly open
2.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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