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问题

____ can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet


____ can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant

A.Overflow valve

B.Reducing valve

C.Balancing valve

D.Reducing valve or balancing valve

请帮忙给出正确答案和分析,谢谢!

参考答案
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