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如图,一轮船以每小时20海里的速度沿正东方向航行.上午8时,该船在A处测得某灯塔...
如图,一轮船以每小时20海里的速度沿正东方向航行.上午8时,该船在A处测得某灯塔位于它的北偏东30°的B处,上午12时行到C处,测得灯塔恰好在它的北偏西60°,
时轮船离灯塔距离最近.
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