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qcad.org
网站标题：	QCAD - QCAD: 2D CAD
网站简介：	QCAD is a free, open source 2D CAD system for Windows, Linux and Mac.
关键字：	QCAD 2D CAD DXF DWG open source Windows Linux Mac OS X Apple scriptable computer-aided design computer-aided drafting

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