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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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單項(xiàng)選擇題

Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy?（）

A.The hydraulic pumps
B.Valves
C.Hydraulic cylinders
D.Hydraulic motors

單項(xiàng)選擇題

The drive motor will have a brake arranged to fail-safe, i√eit will （） the load if power fails or machine is stopped.

A.cast
B.put
C.hold
D.let out