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Re:把绳子侧过来看,那么那四个交点就没有了

Posted by 00448247 at 2009-02-22 22:00:01 on Problem 1660
In Reply To:把绳子侧过来看,那么那四个交点就没有了 Posted by:frkstyc at 2005-05-15 01:00:51
我怎么在平面画不出来这绳子?  谁画画看啊

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