While teaching a course in computer graphics, the author has developed a software package-The North China University of Technology Graphics System(NGS).
在开设“计算机绘图”课程的同时，作者开发了一个软件包——北方工业大学绘图系统（NGS）。
Finally it is made with the aid of the computer package graphics system.
最后借助电脑包装图形制作系统制作出来。
Through the package of mould design, make my own computing skills, improve computer graphics ability, also familiar with a lot of standard selection method.
通过整套模具的设计，使我自己的计算能力，计算机绘图能力有所提高，也熟悉了很多标准件的选择方法。
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