The output volume of a positive fixed displacement pump can be changed only by （）.<br>A:changing the angle of the tilting plate<br>B:changing the speed of the pump<br>C:moving the slide block and rotor<br>D:moving the shaft trunnion block

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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