Using clustering analysis method on the classification of Chinas urban air quality levels, gather into the city air quality in most similar category, analysis of causes, concluded.

运用聚类分析方法对我国城市空气质量等级进行分类，把空气质量状况最相似的城市聚成一类，分析原因、得出结论。

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The category and reason for Finite Element Method analysis error are analyzed, and the adaptive mesh method is researched.

同时分析了有限元分析误差产生的种类及原因，并对自适应单元网格优化进行了研究。

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Modern contact economics begin from a complete set of concept, category and the method of analysis.

现代契约经济学的研究是从一整套概念、范畴和分析方法开始的。

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It will finalize the results of two case studies launched in 2011 within the framework of a joint project of UNESCO, UN Women and CODESRIA, conducted in collaboration with civil society organizations, according to the method of SWOT analysis that identifies strengths, weaknesses, opportunities and threats of a category of people in a given area: in this case, the social movement of women and gender-based violence.

UNESCO: MEDIA SERVICES