单选题Overflow valve is used to （）Acontrol the fluid flow through itBprevent the pressure before it over the specified valveCmake the pressure after it steadyDcontrol the direction of oil flow
单选题
Overflow valve is used to （）
A
control the fluid flow through it
B
prevent the pressure before it over the specified valve
C
make the pressure after it steady
D
control the direction of oil flow
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