adjustment

代码说明：

  三角高程近似平差计算（包括高差计算）程序，外业资料需要整理成练习文档（测站信息）.txt和练习文档（测站点观测信息）.txt的形式(Triangle elevation approximate adjustment calculation (including height difference calculation) program, field data need to be organized into practice document (station information) .txt documents and exercises (the station observation information) .txt form)