Basing on the purpose and functions of risk management it illustrates the definition, character, classification of risk as well as the aim and process of risk management.
从风险管理的目的和意义入手，对风险的定义、性质、分类以及风险管理的目标和程序做了重要论述。
This paper mainly describes the concepts, character, classification, principle and the status of research and application of wetland wastewater treatment technology.
叙述了人工湿地污水处理技术的概念、分类、特点、原理及其在国内外的研究应用现状。
Compared with the classification method purely based on spectral character, this method can improve the classification accuracy and refine object classes in some extent.
与单纯基于光谱特征的分类方法进行比较，该方法在一定程度上改善了分类精度，细化了地物类别。
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