AutoCAD is a computer-aided design software introduced by Autodesk. It has been widely used in engineering design fields such as machinery, architecture, aerospace, light industry, clothing, and military, and has a large user base. It can effectively help engineering and technical personnel to improve the design level and work efficiency. It is a powerful assistant for engineers. In order to allow students to quickly master CAD, 52 self-study network launched this set of CAD2011 tutorials, hoping to get your approval.