Class is the basic element of class structure. It is research that class should hold four basic feature: integrality and sufficiency, primitiveness, high cohesion, low coupling in this paper.

类是类结构的基本元素，本文研究了良好的类应当具备的四个基本特征：完整性和充分性、原子性、高内聚、低耦合。

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There are four post frame molding press and two kinds of structure, the fuselage uses finite element analysis and optimization design of the structure, reasonable structure.

成型压机有四柱和框架二种结构，机身采用有限元件结构分析和优化设计，结构合理。

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By simulating the features of two -, three -, four-high mill with finite element method, the geometric shape, micro-structure and mechanical property of wire section are analyzed.

分析了用有限元法模拟线材二辊、三辊和四辊轧机轧制的特点，对线材断面的几何形状、微观组织和机械性能进行了介绍。

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