单项选择题
在能见度不良时,某船仅在雷达上发现他船,应采取的措施是__。①保持正规瞭望;②使用雷达确定碰撞危险;③将航速减到能维持其航向的最小速度;④该船位于本船的正横以前,则立即大幅度向右转向。 A.
①②③④ B.
②③④ C.
①② D.
①③
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