autocad使用文档： https://help.autodesk.com/view/ACD/2018/CHS/ https://help.autodesk.com/view/ACD/2018/ENU/ https://help.autodesk.com/view/ACD/2019/ENU/ 开发文档：https://www.autodesk.com/developer-network/platform-technologies/autocad 晓东cad论坛：http://bbs.xdcad.net 明经通道：http://bbs.mjtd.com 国外牛人： http://www.lee-mac.com