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^_^

Posted by pladene at 2004-10-19 10:43:09 on Problem 1927
In Reply To:Re:为什么一定是三个圆弧？ Posted by:Grope at 2004-10-19 10:27:08 
想象一滴水，呵呵:)
这个我知道。

可是总感觉不是那么严密。。。。
可否说的详细一点:)
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