（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.<br>A:Overflow valve<br>B:Reducing valve<br>C:Balancing valve<br>D:Reducing valve or balancing valve

（）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

出自：海船船员证

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