选择题:外磁式磁电系仪表的永久磁铁采用( )材料制作。A.高剩磁B.软磁C.高矫顽力D.低剩磁

题目内容:
外磁式磁电系仪表的永久磁铁采用( )材料制作。
A.高剩磁
B.软磁
C.高矫顽力
D.低剩磁
参考答案:

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