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分类: 数学2 (军队文职)
发布时间: 2023-11-03 09:29
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A.对任意闭曲线L，I=0
B.在L为不含原点在内的闭区域的边界线时I=0
C.
D.在L含原点在内时I=0，不含原点时I≠0
正确答案是B
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