单选题In a fixed displacement axial piston hydraulic motor, the speed is varied by（）Aregulating the ratio between torque and speed via the torque limiter at the motorBdirecting the motor output flow through a bypass lineCmaintaining a constant flow and pressure inputDcontrolling the input flow rate
单选题
In a fixed displacement axial piston hydraulic motor, the speed is varied by（）
A
regulating the ratio between torque and speed via the torque limiter at the motor
B
directing the motor output flow through a bypass line
C
maintaining a constant flow and pressure input
D
controlling the input flow rate
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