单项选择题

Usually, emergency electricity supplies to on board（）

A.Cargo winch
B.Windlass
C.Steering gear
D.Main air compressor

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单项选择题

Before doing any work on a hydraulic system equipped with accumulators, you should（）

A.drain the accumulators and purge with oxygen
B.bleed off all stored energy from the accumulators completely
C.charge the accumulators to prevent system energy loss
D.pump the hydraulic fluid into the accumulators to prevent fluid loss

单项选择题

The ability of lubricating oils to resist viscosity changes during temperature changes is indicated by the（）

A.American Petroleum
B.Institute number viscosity index number
C.Seconds Saybolt Furol number
D.Seconds Saybolt Universal number

单项选择题

The in the steering gear move the rudder to the required angel（）

A.control equipment
B.power unit
C.transmission mechanisms
D.fittings and pipeline