單項(xiàng)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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1.單項(xiàng)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
2.單項(xiàng)選擇題The anchor was then（）and the siren sounded.
A.aweigh
B.weight
C.weigh
D.weighing
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