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不一定的。不过,你可以假设这三个图就是cube的三视图。

Posted by fanhqme at 2008-10-04 12:51:03 on Problem 1052
In Reply To:话说。。关于图形的摆放方法。。 Posted by:lingxiangqianyu at 2008-07-25 19:06:12
用ac法证明的。

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