机械CAD操作图纸，可以完整发现CAD图纸的结构和设计方法，内容详细-Mechanical CAD drawing operations can be found in the structure and design methods complete CAD drawings, detailed

有关CAD不依赖AUTOCAD的编程文档，主要介绍相关SDK的使用。(This paper mainly introduces the use of SDK about the programming documents that CAD does not depend on AUTOCAD.)