research on the relationship of Niangjia and nuclear family in north city in China 娘家崛起和界限重构：北方城市小家与娘家的关系研究：research on the relationship of Niangjia and nuclear family in north city in China Research on the relationship between Qin opera and contemporary writers in northwest China 并列题名：Research on the relationship between Qin opera and contemporary writers in northwest China research on international exchange and cooperation of education in China Research on the relationship between organization structure and performance of diversified firms in China