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我知道了，是4。54， 刚才2*pi-a也改了---但还wa ：。（In Reply To:2*pi*r*1/4=4.71,，，那4.54是怎么算的 ？ Posted by:fjnu_jxd_010 at 2005-07-28 15:51:16 Followed by: Post your reply here: |
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