单选题What is the purpose of a relief valve?（）Ato fill 2 tanks at the same timeBto use pump at a higher pressureCto return liquid to suction side if discharge valve is closedDAll of the above are true
单选题
What is the purpose of a relief valve?（）
A
to fill 2 tanks at the same time
B
to use pump at a higher pressure
C
to return liquid to suction side if discharge valve is closed
D
All of the above are true
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