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【单选题】
关于磁力线下列说法正确的是( )A.
磁力线是客观存在的有方向的曲线
B.
磁力线始于磁铁的N极而终于磁铁的S极
C.
磁力线上的箭头表示磁场方向
D.
磁力线上某点处小磁针静止时N极所指的方向与该点曲线的切线方向一定一致
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