单项选择题

Throttling in the （） line of a centrifugal pump involves the risk of the pump cavitation.

A.suction
B.exhaust
C.pressure
D.discharge

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单项选择题

A.draw the liquid in；force the liquid out
B.force the liquid out；draw the liquid in
C.suction；draw
D.deliver；outlet

单项选择题

A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree

单项选择题

Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （）
(1) reciprocating
(2) rotary
(3) centrifugal

A.(1)only
B.(1)and (2)
C.(1),(2)and(3)
D.(2)and(3)