海中有一个小岛,它的周围8海里内有暗礁,渔船跟踪鱼群由西向东航行,在B点测得小岛A在北偏东60°反向上,航行12海里到达D点,这时测得小岛在北偏东30°反向上.如果渔船不变航线继续向东航行,
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![海中有一个小岛,它的周围8海里内有暗礁,渔船跟踪鱼群由西向东航行,在B点测得小岛A在北偏东60°反向上,航行12海里到达D点,这时测得小岛在北偏东30°反向上.如果渔船不变航线继续向东航行,](/uploads/image/z/6880454-62-4.jpg?t=%E6%B5%B7%E4%B8%AD%E6%9C%89%E4%B8%80%E4%B8%AA%E5%B0%8F%E5%B2%9B%2C%E5%AE%83%E7%9A%84%E5%91%A8%E5%9B%B48%E6%B5%B7%E9%87%8C%E5%86%85%E6%9C%89%E6%9A%97%E7%A4%81%2C%E6%B8%94%E8%88%B9%E8%B7%9F%E8%B8%AA%E9%B1%BC%E7%BE%A4%E7%94%B1%E8%A5%BF%E5%90%91%E4%B8%9C%E8%88%AA%E8%A1%8C%2C%E5%9C%A8B%E7%82%B9%E6%B5%8B%E5%BE%97%E5%B0%8F%E5%B2%9BA%E5%9C%A8%E5%8C%97%E5%81%8F%E4%B8%9C60%C2%B0%E5%8F%8D%E5%90%91%E4%B8%8A%2C%E8%88%AA%E8%A1%8C12%E6%B5%B7%E9%87%8C%E5%88%B0%E8%BE%BED%E7%82%B9%2C%E8%BF%99%E6%97%B6%E6%B5%8B%E5%BE%97%E5%B0%8F%E5%B2%9B%E5%9C%A8%E5%8C%97%E5%81%8F%E4%B8%9C30%C2%B0%E5%8F%8D%E5%90%91%E4%B8%8A.%E5%A6%82%E6%9E%9C%E6%B8%94%E8%88%B9%E4%B8%8D%E5%8F%98%E8%88%AA%E7%BA%BF%E7%BB%A7%E7%BB%AD%E5%90%91%E4%B8%9C%E8%88%AA%E8%A1%8C%2C)
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