命令行上选择启动不同版本的AutoCAD -start AutoCAD on a command line by selecting deferent kinds

连接EXCEL和CAD将块的各项属性自动输出到EXCEL表格中再执行直角坐标与极坐标的转换-The properties of the connection EXCEL and CAD will automatically block output to the EXCEL table, and then perform the conversion of Cartesian coordinates and polar coordinates

VB6.0连接CAD后，创建和管理图层，并插入块-VB6.0 After connecting CAD, create and manage layers and insert blocks