AutoCAD R13/R14/R2000 DWG File Specification
Information in these materials is furnished for informational use only, is subject to change without notice and does not represent a commitment on the part of OpenDWG Alliance. OpenDWG Alliance assumes no responsibility or liability for any errors or inaccuracies that may appear in these materials. Use these materials at your own risk.
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很有用,就是版本说明那个少了最新的