【Abstract】Language teachers actively seek ways to improve their understanding about how to teach their students and th......

1. Introduction　　Clustering is a process of sorting objects， elements or data into groups according to their similarity......

目的：了解上海市某区国家基本药物中头孢菌素类抗生素应用的现状及用药特点,为贯彻落实国家基本药物制度提供参考。方法统计17家医......