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單項(xiàng)選擇題

Mooring winches are often combined with （） units so that one prime mover drives both.

A.crane
B.hatch cover
C.windlass
D.steering gear

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

A(n) （） is a mechanical attack on the metal surface which may be due to a disturbance in the flow of the water over the blade of the propeller.

A.erosion
B.corrosion
C.pitting
D.dezincification

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