AD垂直BC EF垂直BC 垂足分别为点D,F 角一等于角二 证明AB平行CD
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![AD垂直BC EF垂直BC 垂足分别为点D,F 角一等于角二 证明AB平行CD](/uploads/image/z/12389573-29-3.jpg?t=AD%E5%9E%82%E7%9B%B4BC+EF%E5%9E%82%E7%9B%B4BC+%E5%9E%82%E8%B6%B3%E5%88%86%E5%88%AB%E4%B8%BA%E7%82%B9D%2CF+%E8%A7%92%E4%B8%80%E7%AD%89%E4%BA%8E%E8%A7%92%E4%BA%8C+%E8%AF%81%E6%98%8EAB%E5%B9%B3%E8%A1%8CCD)
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