单项选择题
A.very good B.good C.poor D.moderate
Our ship has not been to shipyard for a long time, the ...
单项选择题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
Radar is not only to obtain（）,but also to measure their...
单项选择题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
The anchor was then（）and the siren sounded.A.aweighB.we...
单项选择题The anchor was then（）and the siren sounded.
A.aweigh B.weight C.weigh D.weighing
