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https://www.ptc.com/en/technologies/plm/requirements-management

https://www.ptc.com/en/products/windchill

https://support.ptc.com/help/wnc/r12.1.0.0/zh_CN/index.html

https://support.ptc.com/help/wnc/r12.1.0.0/en/#page/Windchill_Help_Center/exportimport/ExportImportAbout.html#

https://players.brightcove.net/1532789042001/HknUe20R_default/index.html?videoId=4721163700001

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