Overflow valve is used to （）<br>A:control the fluid flow through it<br>B:prevent the pressure before it over the specified valve<br>C:make the pressure after it steady<br>D:control the direction of oil flow

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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