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Analysis of Climate Characteristics in Frost-free Period for the nearly 38 Years in Gaoqing County
JING Tao,ZHANG Jing,GUO Lei(Gaoqing County Meteorological Bureau,Gaoqing 256300,Shandong Province,China)
Chinese Journal of Agrometeorology . 2010, (
S1
): 16 -19 .