The article analyzes and summarizes the concept, character and classification methods of PE teaching materials combined with practical teaching.
结合教学实践对体育教材的概念、特性、分类方法进行理论分析和概括，阐述了如何认识教材的本质属性及树立教材观的问题。
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。
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