The diagram, schematic and layout are often attached to the top level board assembly.
该原理图，示意图和布局图往往附着在顶端的板组装件中。
According to the definition of assembly semantics and based on functional characteristics, it classified the assembly semantic from the top-level.
然后根据装配语义的定义，以功能特征为主要参考，对零部件之间的装配语义从顶层进行分类。
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