绘图机选择、使用的几点建议二三九厂民品事业部杨飞计算机辅助设计（ＣＡＤ）作为电子信息技术的一个重要组成部分，是促进科研成果的开发和转化，实现智能劳动自动化，加速国民经济发展和国防现代化的一个关键新技术；是提高产品和工程设计的设计水平、降低消耗、缩短科... Drawing machine selection, the use of a few suggestions 239 Civilian Division Yang Fei Computer-aided design (CAD) As an important part of electronic information technology, is to promote the development and transformation of scientific research, to achieve intelligent labor automation, to speed up the national Economic development and national defense modernization is a key new technology; is to improve the design level of products and engineering design, reduce consumption, shorten the ...