单项选择题

While flowing through the volute in a centrifugal pump, part of the （） energy of the liquid is converted to （） energy.

A.kinetic；pressure
B.kinetic；essential
C.pressure；kinetic
D.pressure；height

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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

A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps

单项选择题

A.positive displacement
B.ejector
C.centrifugal
D.air compressor