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处出发,以每小时40nmile的速度沿东偏南50°方向直线航行,30min后到达 处,在 处有一座灯塔,海轮在A.处观察灯塔,其方向是东偏南20°,在B.处观察灯塔,其方向是北偏东65°,那么B.,C两点间的距离是( ) A.10nmile B.10n mile C.20nmile 20nmile
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