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总结一下2826没有水的情况.如有漏的大家补一下吧。

Posted by ddna at 2006-05-14 23:36:51
1.有一块板水平摆放
2.两块板平行
3.两块板斜率同号,但是一块盖住了另外一块。比如
 *
  *
   *
 *  *
   * *
     **
       *
        **
         * *
          *  *
           *   *
            *    *
4.两块板虽然不平行,但是焦点在延长线上,即不相交

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