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單項選擇題

Our ship has not been to shipyard for a long time, the fouling on the ship’s hull greatly decreases her（）.

A.resistance
B.weight
C.speed
D.displacement

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單項選擇題

Radar is not only to obtain（）,but also to measure their distance away from you.

A.brightness of obtain
B.color of targets
C.shape of targets
D.bearing of objects

單項選擇題

The anchor was then（）and the siren sounded.

A.aweigh
B.weight
C.weigh
D.weighing

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