Although it is easy to define the basic constructs of the ER model, it is not an easy task to distinguish their roles in building the data model. What makes an object an entity or attribute?
虽然建造基本的ER模型是很容易的，但是区别他们在建设数据库时所处的地位并不容易，什么决定了一个对象是实体还是属性呢？
Based on the application study of ANSYS in the optimization design of RC structure t beam, the building method of 3d parametric entity model to RC structure t beam is given.
通过对ANSYS在钢筋混凝土T形梁优化设计中的应用研究，给出了建立钢筋混凝土结构T形梁参数化三维实体模型的方法。
The entity type is the fundamental building block for describing the structure of data with the entity data Model.
实体类型是基本的建置组块，可透过实体资料模型描述资料的结构。
The entity type is the fundamental building block for describing the structure of data with the entity data Model.
实体类型是基本的建置组块，可透过实体资料模型描述资料的结构。
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