单选题The output volume of a positive fixed displacement pump can be changed only by （）.Achanging the angle of the tilting plateBchanging the speed of the pumpCmoving the slide block and rotorDmoving the shaft trunnion block
单选题
The output volume of a positive fixed displacement pump can be changed only by （）.
A
changing the angle of the tilting plate
B
changing the speed of the pump
C
moving the slide block and rotor
D
moving the shaft trunnion block
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