Drawing the mechanical engineering drawing usually need to mark the dimension tolerance of the parts.

绘制机械工程图经常要标注零件的尺寸公差。

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This software can plot freely, draw any figure, mark dimension and tolerance, write symbols and draw surface-roughness symbols. It can also function as a mouse in digitalizer.

本文所述的交互式绘制零件图软件不用编写程序可描绘任意图形，标注尺寸及公差，书写字符及画表面粗糙度符号，并可起到数字化仪的鼠标器作用。

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