In combination with present situation, the way and the method about save water and reuse of wastewater were researched deeply, by means of approach of system engineering.
并结合石化企业的具体情况，用系统工程的分析方法，深入研究节水和水资源化的方法和途径。
By means of constructional iterative equation, this paper presents a way to give out the existence and singularity of a type of equational root with gradual approach method.
本文通过构造迭代函数，利用逐次逼近的方法给出了一类方程根的存在性与唯一性的判断的一种解决方案。
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