this is website is made for my school.-this is website is made for my school.

该网站为我自己编写，包括了吉林大学机械学院工程图学的所有内容，方便本科生自助学习，做毕业设计-The website for my own preparation, including all the elements of Jilin University School of Mechanical Engineering Graphics facilitate self-learning undergraduate, graduate design

上课实例,每题都有注释文件，简明易懂，适合初学vb者使用，并上机练习。-examples learning in school vbp files frm files and so on can be used in vb learing please check it thank you.my english is not very well,translation is out of order

这是我自己用vb.net写的几个很简明的基础类库，很适合初学者或业余爱好者使用。主要包括：DataManager库（参数化的数据库操作类库，支持Access、SQL Server以及excel文件三种格式，用它就再也无需拼写繁琐的sql语句了），Geometry库（平面几何的类库，包括点、直线、线段、圆、向量等对象，支持平移、翻转、缩放、求垂足、求焦点、求夹角、求切线等等多种方法，基本涵盖了中学平面几何的所有内容），Json库（好用的Json文本解析工具，当然功能比较简单）。-This is m