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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A.kinetic；pressure
B.kinetic；essential
C.pressure；kinetic
D.pressure；height
A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree
A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps
A.positive displacement
B.ejector
C.centrifugal
D.air compressor
A.single screw pump
B.double-screw pump
C.triple screw pump
D.centripetal pump
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