The hierarchy and design method for software frame is studied and the role and Function of each hierarchy is described.
研究了仿真软件框架的设计方法和结构层次的关系，并对各个层次功能要求进行了介绍。
The chemical structure, the principle of washing aid function and manufacture method of layered crystal sodium disilicate were described. And its application prospect was analysed.
阐述了层状晶态硅酸钠的化学结构、助洗功能原理、基本的生产方法，并对其在洗涤剂方面的应用前景做了分析。
A new process of room temperature blackening of copper product surface is described. The composition, function and use method of the blackening solution are presented.
报道了铜制品表面常温发黑的新工艺，介绍了发黑剂的组成、作用和使用方法。
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