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單項選擇題

Which of the following can be used in hydraulic transmission system?（）

A.Hydraulic oil
B.Animal oil
C.Light oil
D.Fuel oil

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單項選擇題

（） play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.

A.Motors
B.Check valves
C.Safety valves
D.Reducing valve

單項選擇題

Cargo handling unit is rated according to the （） to be lifted.

A.cargo crane
B.jib
C.safe working load
D.oil pressure

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