单项选择题
A.Cargo winches B.Mooring winches C.Windlasses D.Cargo hatches
Among the basic categories of equipment, which of the f...
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
（） are used for cargo handling.A.CranesB.Mooring winche...
单项选择题（） are used for cargo handling.
A.Cranes B.Mooring winches C.Windlasses D.Foreman
In a hydraulic system, （） are used to protect the syste...
单项选择题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
