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【简答题】
利用 Grenn 公式计算下列积分 (1) , 逆时针方向 (2) 的正向边界 (3) 所围 第一象限正向 (4) 正向 . (5) 是以 和 为顶点 (6) , 其中 为 取逆时针方向 .
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A.
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B.
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