1·Taking jack as an example, the selective principia of software tool and lectotype project was analyzed, the facture process of simulating water flow and enlarging sample for spring was presented.
并以千斤顶为例，分析了工具软件和选型方案的选择原则，给出了放样弹簧、模拟水流等的制作过程。
2·This paper mainly expounds the basic connotation of recycling economy, points concept, implementary principia and method of mining recycle economy.
阐述了矿业循环经济的基本内涵，指出了矿业循环经济的概念、实施原则和方式。
3·At last, after concluding the principia and method of optimization of code, the engine is optimized, especially for Gauss-Kruger projection program.
最后，研究了引擎的编程代码优化，给出了代码优化的原则和方法，并对优化的方法进行了比较。
4·Introducing Intranet security resolvent's goal, principia, constitutes and keystone.
提出网络安全设计的目标、原则、组成部分及侧重点。
5·The research of waters Supply price: Include the principia of water supply price, the method of water supply pricing, the analysis of water supply cost and the influence factor of water supply price.
供水价格研究：包括供水价格制定原则、供水价格制定方法、供水成本分析以及供水价格影响因素。