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。
Today's PLM or PDM systems often recognize that the diagram, schematic and layout all essentially represents the same electronics assembly.
今天的PLM或PDM系统通常承认，原理图，示意图和布局都基本上代表了相同的电子组装件。
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