What is the purpose of a relief valve?（）<br>A:to fill 2 tanks at the same time<br>B:to use pump at a higher pressure<br>C:to return liquid to suction side if discharge valve is closed<br>D:All of the above are true

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

出自：海船船员证

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