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Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）
A:The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow
B:The pump packing gland overheats after short operating periods
C:The motor over-current protective device continually shuts the pump down
D:Pounding noises can be heard at the pump suction chest

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出自：海船船员证

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