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
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相关考题
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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 -
单项选择题
Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.
A.positive displacement
B.ejector
C.centrifugal
D.air compressor -
单项选择题
In a （） the center screw is driven and the outer screws idle.
A.single screw pump
B.double-screw pump
C.triple screw pump
D.centripetal pump
