【单选题】【消耗次数：1】
确定直线与什么之间夹角关系的工作称为直线定向?（ ）。
①
水平线
②
东西方向线
③
标准方向线
④
基准线
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【简答题】
确定直线与标准方向之间的夹角关系的工作称为[填空(1)]
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