單項(xiàng)選擇題

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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單項(xiàng)選擇題

A screw pump belongs to （） according to its working principle.

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

單項(xiàng)選擇題

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