问题
多项选择题
水平角观测中采取盘左、盘右的方法可消除（）
A.视准轴不垂直于横轴的误差；
B.横轴不垂直于竖轴的误差；
C.度盘偏心误差。
D.I角误差
E.光学对点器引起的误差
答案
参考答案：A, B, C
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水平角观测中采取盘左、盘右的方法可消除（）
A.视准轴不垂直于横轴的误差；
B.横轴不垂直于竖轴的误差；
C.度盘偏心误差。
D.I角误差
E.光学对点器引起的误差
参考答案：A, B, C
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