单项选择题

It is important with all hydraulic systems to ensure that interlocking arrangements provided for pump or motor control levers are （） before the pump driving motor can be started.

A.in the pert position
B.in the starboard position
C.in the neutral position
D.to be dismantled

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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

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