单项选择题

Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?（）

A.hydraulic pumps
B.valves
C.hydraulic cylinders
D.hydraulic motors

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单项选择题

A.Cranes
B.Mooring winches
C.Windlasses
D.Foreman

单项选择题

A.stop valves
B.check valves
C.safety valves
D.reducing valves

单项选择题

A.an electric motor
B.a diesel engine
C.a compressor
D.oil