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水准测量时,前后视距相等具有什么好处?

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正确答案:

(1)抵消长水准轴LL不平行于视准轴CC的误差影响;

(2)抵消弧面差及大气折光差的影响;

(3)减少调焦,提高观测精度和速度

答案解析:

暂无解析

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