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【单选题】
关于麦克斯韦方程的描述错误的是（ ）。A.
环路定理实质在于说明激发涡旋磁场的来源是位移电流。
B.
变化的磁场将产生涡旋电场。
C.
变化的电场将激发涡旋磁场。
D.
麦克斯韦方程组包括四个方程式，一个来源于环路定律，一个来源于法拉第电磁感应定律，其余两个分别从电和磁的定律导出。
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