By using the method of cluster analysis, the annual variation curve types of the sunshinepercentage in China are divided into 12 divisions.
本文根据日照百分率年变程曲线类型，应用聚类分析方法，把全国划分为12个日照区。
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The main research achievements are as follows:There was a decreasing trend of the sunshine duration and sunshinepercentageof year and growing season from 1951 to 2008.