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單項(xiàng)選擇題

The pipe friction and the resistance will （） as a result of an increase in the amount of fluid flowing through the system.

A.reduce
B.rise
C.raise
D.fall

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單項(xiàng)選擇題

Air chambers are usually fitted to reciprocating pumps in order to （）.

A.increase discharge pressure
B.increase suction vacuum
C.develop pulsation flow
D.keep a steady rate of flow

單項(xiàng)選擇題

Some pumps use packing as sealing glandThe gland should be （）.

A.slack enough to allow slight leakage of fluid
B.slightly clocked
C.brought up tight so as not to allow any leakage
D.fitted with a relief valve

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