Report - 1photo.sohu.com/20040923/Img222194354.pdf2004/09/23  · - 1 - 第十二章 曲线、曲面积分及场论初步 一. 计算曲线积分 =∫ L I | y |dl,双纽线(x2 +y2 )2 =a2 (x2

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