【Abstract】This paper analyzes the influence of rural education on social stratification and social mobility for rural ......

Earlier in 2016， at the Whitney Museum of American Art， in New York， visitors paraded through the fifth floor to see a retr......

目的 筛选鼠疫菌质粒上保守、稳定、特异的DNA标识序列.方法 选择32条源于鼠疫菌质粒上DNA序列,采用常规PCR技术,对云南家、野鼠两......

以聚酯笼式终缩聚反应器开发为背景,在采用库特流模型对反应器偏心环隙流功率特性进行理论分析的基础上,考查了介质黏度、装料液位......