单项选择题
A.throttling the pressure line B.changing the speed of the driving rotor C.either A or B D.None of the above is tree
The amount of fluid delivered by a reciprocating pump c...
单项选择题The amount of fluid delivered by a reciprocating pump can be regulated by （）.
A.throttling the pressure line B.changing the speed of the piston C.either A or B D.None of the above is tree
The amount of fluid delivered by a centrifugal pump can...
单项选择题The amount of fluid delivered by a centrifugal 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
While flowing through the volute in a centrifugal pump,...
单项选择题While flowing through the volute in a centrifugal pump, part of the （） energy of the liquid is converted to （） energy.
A.kinetic；pressure B.kinetic；essential C.pressure；kinetic D.pressure；height
