【单选题】【消耗次数：1】
用经纬仪进行水平角度测量时，采用盘左、盘右两个盘位进行观测取平均值的方法，可以消除（ ）对观测结果的影响。
①
仪器整平的误差
②
外界条件的影响
③
仪器对中的误差
④
视准轴不垂直于横轴的误差
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