单项选择题

A （） pump is that where the volume of the pump chamber is alternately increased to draw the liquid in and then decreased to force the liquid out.

A.injector
B.positive displacement
C.centrifugal
D.centripetal

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单项选择题

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

A.injector pumps
B.positive displacement pumps
C.centrifugal pump
D.centripetal pumps

单项选择题

Shaft sealing in a centrifugal pump can be effected by （）.

A.the mechanical seal
B.packed stuffing boxes
C.either A or B
D.neither A nor B

单项选择题

As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （）
(1)the rotor
(2)the pump shaft
(3)the external surface of the housing

A.(1) only
B.(2) only
C.(1) and (2)
D.(1),(2)and(3)