在第二章中，介绍了一些机械制图的基本知识及制图规则，并介绍了二维图形特征的概念。
In Chapter 2, some basic knowledge and rulers on mechanical drawing are reviewed, and the computer of two dimensional view features is introduced.
在第二章中，介绍了一些机械制图的基本知识及制图规则，并介绍了二维图形特征的概念。
In Chapter 2, some basic knowledge and rulers on mechanical drawing are reviewed, and the computer of two dimensional view features is introduced.
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