单项选择题
The amount of fluid delivered by a centrifugal pump can be regulated by （）.
A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree
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相关考题
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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 -
单项选择题
The amount of fluid delivered by a screw pump can be regulated by （）.
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 screw pump belongs to （） according to its working principle.
A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps
