Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump is a result of （）.<br>A:cavitation<br>B:water hammer<br>C:fluid friction<br>D:steam knock

Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump is a result of （）.
A:cavitation
B:water hammer
C:fluid friction
D:steam knock

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