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單項選擇題

External and internal leakage in hydraulic systems may be caused by （）.

A.unusual vibration
B.excessive worn parts
C.abnormal pressure
D.any of the above

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單項選擇題

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

單項選擇題

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