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
点击查看答案&解析
相关考题
-
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 -
单项选择题
The discharge flow of a reciprocating pump is （）.
A.steady
B.in pulsation
C.continuous
D.large -
单项选择题
A centrifugal pump produces the required pressure energy by means of a rotating （） provided with vanes.
A.propeller
B.impeller
C.circumference
D.screw
