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Re:注意夹角为π的情况

Posted by justjude at 2007-08-20 02:22:53 on Problem 1031
In Reply To:注意夹角为π的情况 Posted by:heben99 at 2007-08-18 12:30:39 
夹角不会为π时吧～
The lamp may be located either outside or inside the fence, but not on its side as it is shown in the following sample pictures
但是我一直WA，莫非。。。
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