Do not need standard format and DXF format, save DXF format directly.

Method 1. The simplest method: open the drawing and save it in DXF format; Close CAD, reopen the DXF format diagram just now, and save it as DWG format again; When you open DWG again in the future, it won't be there. Some graphics will prompt that the graphics are incomplete after this processing, so another method is used: Method 2. Open the drawing and execute: file-drawing utility-repair command; Save as DXF format; Close CAD, reopen the DXF format diagram just now, and save it as DWG format again; When you open DWG again in the future, it won't be there.

Method 3: Go to the next educational version of the small software Baidu and you will find it. The icon is a skull, which is processed in batches by software.