单项选择题

Centrifugal pumps can be designed with a number of impellers （） to attain a high final delivery pressure.

A.in series
B.in parallel
C.either A or B
D.None of the above is tree

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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.（2）and（3）
D.（1），（2）and（3）

单项选择题

Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump?（）
(1) Its discharge is continuous
(2) It has no internal valves
(3) Upon accidental closing of discharge valve, excessive pressure will not build up

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

单项选择题

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