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利用ＳＡＳ软件中的Ｃｌｕｓｔｅｒ 过程编制程序绘制了分类的树枝图，结合专业知识及统计上分类较佳标准，对肠杆菌中的８９株标准菌进行数值分类，收到了良好的效果。
By using the Cluster process programming software in SAS software, the classified tree branches were drawn. Based on the professional knowledge and the better statistical classification, 89 strains of Enterobacteriaceae were numerically classified and received good results.