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單項選擇題

The officer in charge of the engineering watch shall continue to be responsible for machinery operations, （）the presence of the chief engineer in the machinery space.

A.as long as
B.unless
C.despite
D.till

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單項選擇題

We have stayed at Shanghai port for a long timeThe fouling on the ship’s hull greatly increases her （）.

A.power
B.speed
C.resistance
D.thrust force

單項選擇題

We’d better （）economic speed （）fuel consumption.

A.take；save
B.to take；save
C.take；to save
D.to take；to save

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