单选题（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.AOverflow valveBReducing valveCBalancing valveDReducing valve or balancing valve
单选题
（）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
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