【单选题】【消耗次数：1】
在水平角和竖直角观测中，利用盘左盘右观测不可以抵消（ ）误差？
①
视准轴不垂直于横轴
②
经纬仪对中
③
横轴不垂直于竖轴
④
指标差
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【单选题】
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。
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