二是设计对象知识，主要来源于设计规范、结构原形、同类型产品等。
The other is the knowledge of design object, which the main source from the design criterion, structure and similar product, etc.
二是设计对象知识，主要来源于设计规范、结构原形、同类型产品等。
The other is the knowledge of design object, which the main source from the design criterion, structure and similar product, etc.
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