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【多选题】
关于磁感应线和磁场，下列说法正确的是A.
磁感应线是环绕电流的闭合曲线，无头无尾
B.
任意两条磁感应线在空间不能相交
C.
磁感应线的环绕方向与电流方向之间构成右手螺旋
D.
磁场是无源场，是涡旋场
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