【单选题】【消耗次数：1】
用测回法测水平角，各测回间改变度盘起始位置是为了消除（ ）误差。
①
视准轴
②
横轴
③
指标差
④
度盘刻划不均匀误差
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相关题目
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用光学经纬仪按测回法进行水平角度测量，当进行多测回法观测时，为了减少度盘刻划不均匀误差的影响，各测回间应按（ ）的差值变换度盘起始位置。
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