If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.<br>A:excessive pump speed<br>B:excessive suction head<br>C:worn wearing rings<br>D:gross pump misalignment

If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.
A:excessive pump speed
B:excessive suction head
C:worn wearing rings
D:gross pump misalignment

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