單項選擇題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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1.單項選擇題() are used for cargo handling.

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

2.單項選擇題In a hydraulic system, () are used to protect the system from over pressure.

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

3.單項選擇題A hydraulic motor may be driven by ().

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

4.單項選擇題A high rate of separation between oil and water is favored by ().

A.large size of oil globule
B.low temperature
C.high viscosity
D.high flow rate