“sketch of three-north direction”的概念、定义、翻译、参考文献-科学参考

单词	sketch of three-north direction
释义	sketch of three-north direction Encyclopedia 工学地图数学要素释 sketch of three-north direction三北方向图地图上标明真北方向、坐标北方向和磁北方向关系的方向图。
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