使用AutoCAD进行地形图测绘高级开发的参考书，对于基于LISP二次开发的人员具有重要使用价值。-Topographic mapping using AutoCAD for advanced development of reference books, for the secondary development of LISP-based staff have an important value.

关于CAD的二次开发快捷键常用命令的集合，安装后可以加速工作人员工作。-On the secondary development of CAD collection of commonly used commands shortcuts after installation can speed up the work of staff.