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zuki zuki zuki Kaware
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$$\oint_{\substack{L}} Pdx+Qdy = \iint_{\substack{S}} (\frac {\partial Q} {\partial x} - \frac {\partial P} {\partial y})dxdy$$
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千瓦喜欢玩《根深因怕》。
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chensichen
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