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【单选题】
关于电工材料,下列说法哪一种不正( )。
A.
外磁场消失后磁性基本消失的磁性材料称软磁材料
B.
外磁场消失后磁性基本保留的磁性材料称硬性材料,硬磁材料用于电气设备的铁心
C.
电阻材料用于生产各类电阻器、分流器
D.
电热材料用于生产电热丝等电热元件
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