形状和孔、槽的分布形式不同，其中心距定位尺寸的标注形式也不一样。
Since the basic shape of the board and the distribution of holes and grooves are different, the formats of location dimensions for dimensioning center-to-center spacing are also different.
该方法充分利用了HTML文档内在的树状结构，设计了简单方便的样本网页标注形式。
The method makes use of the native tree structure of HTML document and designs a new simple form of labeling the example pages.
不规则形式标注在括号内。
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