單項(xiàng)選擇題

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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單項(xiàng)選擇題
The packing installed in the pump stuffing box is lubricated by （）.
A.gravity and feed oil cups
B.grease cups
C.hand during installation
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單項(xiàng)選擇題
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A.a needle gun
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