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單項(xiàng)選擇題

The symbol (GB786√1-93) at right side represents （）

A.overflow valve
B.reducing valve
C.relief valve
D.sequence valve

單項(xiàng)選擇題

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