在正方体ABCD-A'B'C'D'中,E,F分别为棱AA',CC'中点,则在空间中与三条直线A'D',EF,CD都相交的直线有几条?
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![在正方体ABCD-A'B'C'D'中,E,F分别为棱AA',CC'中点,则在空间中与三条直线A'D',EF,CD都相交的直线有几条?](/uploads/image/z/7246177-25-7.jpg?t=%E5%9C%A8%E6%AD%A3%E6%96%B9%E4%BD%93ABCD-A%27B%27C%27D%27%E4%B8%AD%2CE%2CF%E5%88%86%E5%88%AB%E4%B8%BA%E6%A3%B1AA%27%2CCC%27%E4%B8%AD%E7%82%B9%2C%E5%88%99%E5%9C%A8%E7%A9%BA%E9%97%B4%E4%B8%AD%E4%B8%8E%E4%B8%89%E6%9D%A1%E7%9B%B4%E7%BA%BFA%27D%27%2CEF%2CCD%E9%83%BD%E7%9B%B8%E4%BA%A4%E7%9A%84%E7%9B%B4%E7%BA%BF%E6%9C%89%E5%87%A0%E6%9D%A1%3F)
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