单项选择题

The advantage of a centrifugal pump as compared with a reciprocating pump is that （）.

A.discharge is continuous
B.it has no internal valves
C.upon accidental closing of discharge valve, excessive pressure will not build up
D.all of the above are true

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单项选择题

A pump is said to have "negative suction head" when the pump is located （）.

A.between the suction and discharge
B.below the liquid supply
C.above the liquid supply
D.any of the above

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) vane
(3) gear

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

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）