This paper introduce how to retrieve Web information by search engine from five aspects of search engine, working mechanism, standards evaluation, classification, methods and skills.
从搜索引擎的工作机理，评价标准，分类，使用方法，使用技巧等五个方面介绍如何利用搜索引擎检索网络信息。
Classification standards of indicators for soil quality evaluation were put forward and the situations of soil property of Hebei Plain were discussed.
提出了河北平原土壤质量评价指标的分级标准，依据该标准对河北平原典型土壤样品进行了单因素评价。
Secondly, this thesis analyzes the current main wireless sensor network's basic principles of localization algorithm, and its performance evaluation standards and classification method.
其次，论文分析了当今主流的无线传感器网络定位算法的基本原理及其性能评价标准和分类方法。
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