... isolong 等经度改正线 isomagnetic chart 等磁力线图 isometric coordinate 等量坐标 ...
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短语
等磁力曲线图
curves of total magnetic intensity
;
curves of total magnetic force
等水平磁力曲线图
curves of equal horizontal magnetic force
;
curve of equal horizontal magnetic force
等垂直磁力曲线图
curves of equal vertical magnetic force