I am wrong taking A as circlar sector

本帖於 2010-04-08 18:00:37 時間, 由版主 於德利 編輯
回答: 回複:回複:求助:誰能幫我一下?jinjing2010-03-28 11:25:13

I'm sorry,I'm total wrong, as I think A is circlar sector.You are right.

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