Cad2020 introductory learning (2021.4.13)

Ways of learning ： Software Manager CAD2018 Online course
First step Familiar with the interface
The second step newly build 、 preservation 、 close
The third step Basic operation ： mouse , command , Relative coordinates and polar coordinates
** Step four **
Search for ：CAD Shortcut key

1. Draw a straight line L
2. A circle C
3. Draw an arc A
4. The ellipse EL
5. rectangular REC
6. polygon
7. Multi line