According to constraint relation of graph, a serialization of products is designed in this system.
在软件设计中，根据图形的约束关系进行产品的系列化设计。
Standard Products - product standardization and serialization of design, quality stable and reliable and can meet different requirements.
标准产品——产品标准化、系列化设计，质量稳定可靠，可满足不同的要求。
The gas meter is a kind of serialization products. Although the main difference is that gas meters of the same series possess different flux, they have the comparability in the entire structure.
燃气表是一种系列化产品，同一系列产品的主要区别是燃气表流量的不同，而它们的整体结构具有相似性。
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