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CAD problem, the drawing is too big, how to reduce its memory occupation?
Steps of graphic cleaning in Chen Hao CAD;

Open Chen Hao CAD software, then enter the shortcut key command of CAD cleaning at the command line: PU, and press Enter to confirm. Then a cleaning dialog box will pop up, and you can choose the items to be cleaned or clean them all according to your own needs.

If you choose Clean All, the Clean-Confirm Clean dialog box will pop up after executing the command, and you can only choose to clean all items.