单项选择题
A.kinetic；pressure B.kinetic；essential C.pressure；kinetic D.pressure；height
The amount of fluid delivered by a screw pump can be re...
单项选择题The amount of fluid delivered by a screw pump can be regulated by （）.
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 screw pump belongs to （） according to its working pri...
单项选择题A screw pump belongs to （） according to its working principle.
A.reciprocating pumps B.positive displacement pumps C.centrifugal pumps D.centripetal pumps
Through a （） pump, the liquid is transferred from the s...
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
