【多选题】【消耗次数：1】
经纬仪测角时，用盘左、盘右取平均值的方法可以消除下面哪种误差（）
①
视准轴不垂直于横轴
②
横轴不垂直于竖轴
③
十字丝纵丝垂直于横轴
④
水准管轴垂直于竖轴
参考答案：
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