This article take the Dalian development zone four high schools as the object of study, has carried on a more thorough analysis from the theory and the practice stratification plane.
本文以大连开发区四所高中为研究对象，从理论和实践的层面进行了较为深入的分析。
Part III is the empirical analysis of social stratification for the pre-school education opportunity.
第三部分为社会分层对幼儿教育入学机会的实证分析。
Cluster analysis of directional data is important to temporal clustering analysis of disease and stratification of season.
方向数据的聚类分析法对与疾病的时间聚集性进行分析、季节分层分类等有极其重要的意义。
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