Here, though, there's a problem: a search for model and year must use the Assembly table, but the part number and part description can only be found in the Inventory table.
但这里存在一个问题：搜索型号和年份必须使用assembly表，但是零件号和零件描述只能在Inventory表中找到。
Taking a stepped shaft as example, the paper shows the part information expressed with the part description model based on ontology can describe the part rationally and effectively.
以某阶梯轴为例，表明利用基于本体的零件描述模型对零件信息进行表达，可以更加合理有效地描述领域本体知识库中的零件信息。
Taking a stepped shaft as example, the paper shows the part information expressed with the part description model based on ontology can describe the part rationally and effectively.
介绍了一种基于机械工程图的零件信息描述的方法单元型面描述法，并给出了一个应用实例。
Taking a stepped shaft as example, the paper shows the part information expressed with the part description model based on ontology can describe the part rationally and effectively.
介绍了一种基于机械工程图的零件信息描述的方法单元型面描述法，并给出了一个应用实例。
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