单项选择题
Overload protection on hydraulic system is provided by the use of （）.
A.stop valves
B.pressure relief valves
C.balance valves
D.regulating speed valves
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相关考题
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单项选择题
The most common forms of main drive used on deck auxiliaries are （）.
A.steam plants, electric motors and compressed air
B.diesel engine, hydraulic machinery and compressed air
C.steam plants, electric motors and hydraulic machinery
D.diesel engines, steam plants and hydraulic machinery -
单项选择题
Mooring winches are often combined with （） units so that one prime mover drives both.
A.crane
B.hatch cover
C.windlass
D.steering gear -
单项选择题
Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.
A.possible
B.necessary
C.practicable
D.impracticable
