A variable displacement system of hydraulic drives consists of （）.<br>A:a variable displacement axial piston pump<br>B:a constant displacement axial piston pump<br>C:a reciprocating piston pump<br>D:a centrifugal pump

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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