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是

Posted by frkstyc at 2006-06-29 20:19:07 on Problem 2852
In Reply To:这个题目什么意思啊？ Posted by:Dzx at 2006-06-29 20:15:59 
> 是说两条射线可以不交么？
> 如果不交求公垂线段的中点？
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