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單項(xiàng)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

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單項(xiàng)選擇題

（） 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

單項(xiàng)選擇題

Among the basic categories of equipment, which of the following is used to convert hydraulic energy into continuous rotary motion?（）

A.Hydraulic pumps
B.Valve
C.Hydraulic cylinders
D.Hydraulic motors

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