If you were operating a centrifugal water service pump with worn wearing rings the _____.

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If you were operating a centrifugal water service pump with worn wearing rings, the _____.

A.pump would be very noisy

B.pump would vibrate excessively

C.pump would develop insufficient flow

D.stuffing box would leak excessively

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热搜:a是b的充分条件,b是a的必要条件吗