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晕，可能我表述不清。不过我觉得应该加上这句：In Reply To:出题者都说了，是简单的，意思就是不自交的，怎么还在猜疑？ Posted by:hawk at 2005-05-14 13:08:36 （图中虚线和实线组成的）三角形构成的边界(closed surface)，即：三维柱状物的边界，可以自交。 Followed by: Post your reply here: |
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