并能正确标注尺寸及加工表面符号，公差与配合。
Learning to mark dimensions, manufacturing surface symbols tolerance and fittings correctly.
零件尺寸的两个极限之差称为公差，这是一个没有符号的绝对量值。
The difference between the two limits of size of a part is called the tolerance, an absolute amount without sign.
当具有公差要求的被测要素为线或平面时，将指引线箭头和基准符号指在线或平面上，且必须与尺寸线错开。
If the element being tested with a tolerance requirement is a contour line or surface, point the arrow and datum symbol to the contour line or surface, and keep it away from the dimension line.
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。
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.
技术制图。几何形位公差的符号。比例和尺寸。
Technical drawings. Symbols for geometrical tolerancing. Proportions and dimensions.
技术制图。几何形位公差的符号。比例和尺寸。
Technical drawings. Symbols for geometrical tolerancing. Proportions and dimensions.
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