单选题Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.Acontrol the back pressure of return oilBlock the oil lines under some conditionsCchange the direction of oil flowDact as relief valve
单选题
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
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