At the end of the paper the formation and development of the drafting system are described on the example of the assembly drawing of a brake coupling.

文章最后以制动轮联轴器装配图为例，对绘图系统的建立和二次开发进行了说明。

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The framework of attention and three different levels of the system, making a clear hierarchical system structure, the system reduces coupling and increase development efficiency.

三个框架关注与系统的不同层次，使得系统结构层次清晰，系统耦合性降低，增加开发效率。

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The coupling of random analysis, fuzzy analysis and Grey system of water resource and the application of GIS, RS and GPS in water environment prediction the trends of development in future.

最后指出水资源研究的随机分析、模糊分析和灰色系统的耦合与GIS、RS和GPS的应用是今后湖泊水环境预测的发展趋势。

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