Early introduction and studies on the western double reflecting octant in china 中国早期对西方双反射八分仪的介绍和研究
2.
The overall design of the double reflector optical - electronic theodolite is studied on the background of " the x small remote - control optical - electronic theodolite " 以“ x小型遥控光电经纬仪”为背景，研究了双反射镜式光电经纬仪的总体设计。
