12.如图6-11所示:从山顶测得同一方向的A,B两点的俯角分别为30°,60°.已知AB=140m,求山高CD. 14.12.如图6-11所示:从山顶测得同一方向的A,B两点的俯角分别为30°,60°.已知AB=140m,求山高C
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![12.如图6-11所示:从山顶测得同一方向的A,B两点的俯角分别为30°,60°.已知AB=140m,求山高CD. 14.12.如图6-11所示:从山顶测得同一方向的A,B两点的俯角分别为30°,60°.已知AB=140m,求山高C](/uploads/image/z/9592438-22-8.jpg?t=12%EF%BC%8E%E5%A6%82%E5%9B%BE6-11%E6%89%80%E7%A4%BA%EF%BC%9A%E4%BB%8E%E5%B1%B1%E9%A1%B6%E6%B5%8B%E5%BE%97%E5%90%8C%E4%B8%80%E6%96%B9%E5%90%91%E7%9A%84A%2CB%E4%B8%A4%E7%82%B9%E7%9A%84%E4%BF%AF%E8%A7%92%E5%88%86%E5%88%AB%E4%B8%BA30%C2%B0%2C60%C2%B0%EF%BC%8E%E5%B7%B2%E7%9F%A5AB%3D140m%2C%E6%B1%82%E5%B1%B1%E9%AB%98CD%EF%BC%8E+14%EF%BC%8E12%EF%BC%8E%E5%A6%82%E5%9B%BE6-11%E6%89%80%E7%A4%BA%EF%BC%9A%E4%BB%8E%E5%B1%B1%E9%A1%B6%E6%B5%8B%E5%BE%97%E5%90%8C%E4%B8%80%E6%96%B9%E5%90%91%E7%9A%84A%EF%BC%8CB%E4%B8%A4%E7%82%B9%E7%9A%84%E4%BF%AF%E8%A7%92%E5%88%86%E5%88%AB%E4%B8%BA30%C2%B0%EF%BC%8C60%C2%B0%EF%BC%8E%E5%B7%B2%E7%9F%A5AB%3D140m%EF%BC%8C%E6%B1%82%E5%B1%B1%E9%AB%98C)
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