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單項選擇題

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

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

你可能感興趣的試題

單項選擇題

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

單項選擇題

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

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