Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.<br>A:control the back pressure of return oil<br>B:lock the oil lines under some conditions<br>C:change the direction of oil flow<br>D:act as relief valve

Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.
A:control the back pressure of return oil
B:lock the oil lines under some conditions
C:change the direction of oil flow
D:act as relief valve

出自：海船船员证

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