单项选择题
A.unusual vibration B.excessive worn parts C.abnormal pressure D.any of the above
What type of valve is used to direct the flow of hydrau...
单项选择题What type of valve is used to direct the flow of hydraulic fluid?（）
A.Relief valve B.Direction control valve C.Stop valve D.Pressure control valve
The rotor of the hydraulic motor rotates at a speed pro...
单项选择题The rotor of the hydraulic motor rotates at a speed proportional to the （）.
A.flow of oil B.pressure of oil C.A and B D.temperature of oil
（） are used to limit the pressure in any particular por...
单项选择题（） are used to limit the pressure in any particular portion and mainly control the pressure after the valve.
A.Relief valves B.Check valves C.Safety valves D.Reducing valve
