Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）<br>A:Pressure-reducing valve<br>B:Unloading valve<br>C:Counterbalance valve<br>D:Pressure-relief valve

Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）
A:Pressure-reducing valve
B:Unloading valve
C:Counterbalance valve
D:Pressure-relief valve

出自：海船船员证

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