A method of precise levelling under unequal back-and fore-sight length is studied and presented in this paper.
本文研究提出了在前后视距不相等的情况下进行精密水准测量的方法，分析了具体的实测方案。
Back sights are indicated by reversing the from and to stations relative to the fore sight between the stations.
后瞄准器是通过将站与站之间相对于前瞄准器的方向颠倒来指示的。
Back sights are indicated by reversing the from and to stations relative to the fore sight between the stations.
后瞄准器是通过将站与站之间相对于前瞄准器的方向颠倒来指示的。
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