等磁力线图 isomagnetic chart
等磁力曲线图 curves of total magnetic intensity ; curves of total magnetic force
磁力等差线 [物] isonomalis
等磁力曲线 isodynamic curve ; curve of equal magnetic force
等强磁力线 isodynamicline
等垂直磁力曲线图 curves of equal vertical magnetic force
等水平磁力曲线图 curves of equal horizontal magnetic force ; curve of equal horizontal magnetic force
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