单项选择题

A variable displacement system of hydraulic drives consists of （）.

A.a variable displacement axial piston pump
B.a constant displacement axial piston pump
C.a reciprocating piston pump
D.a centrifugal pump

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单项选择题

A.Constant pressure system
B.Variable pressure system
C.Variable displacement system
D.Constant volume system

单项选择题

A.in the pert position
B.in the starboard position
C.in the neutral position
D.to be dismantled

单项选择题

A.stop valves
B.pressure relief valves
C.balance valves
D.regulating speed valves