If a centrifugal pump vibrates and is noisy when operating, the cause could be （）.<br>A:worn gland sealing shaft<br>B:worn wearing rings<br>C:a bent shaft<br>D:reversed pump coupling

If a centrifugal pump vibrates and is noisy when operating, the cause could be （）.
A:worn gland sealing shaft
B:worn wearing rings
C:a bent shaft
D:reversed pump coupling

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