單項(xiàng)選擇題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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1.單項(xiàng)選擇題A reciprocating pump belongs to （） according to its working principle.
A.injector pumps
B.positive displacement pumps
C.centrifugal pump
D.centripetal pumps
2.單項(xiàng)選擇題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
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