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问题

The output volume of a positive fixed displacement pump can be changed only by _____.A.cha


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

请帮忙给出正确答案和分析,谢谢!

参考答案
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