单项选择题

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

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单项选择题

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

单项选择题

A.Volute pump
B.Diffuser pump
C.Regenerative pump
D.All of the above

单项选择题

A.mixed-flow
B.axial-flow
C.centrifugal
D.displacement