单项选择题
The capacity of a centrifugal pump can be increased by the installation of a larger diameter impeller Another means of increasing the pump capacity is to （）.
A.increase speed
B.increase the size of the cardent assembly
C.reduce wearing ring clearances
D.change the pump to a "close coupled" arrangement
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单项选择题
Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）
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