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 the relationship between investment and economic growth of Shenzhen Research on the relationship between venture capital and enterprise innovation research on the relationship of Niangjia and nuclear family in north city in China 并列题名：Study on the relationship between economic and social coordinated development in northwest China Study on the relationship between economic and social coordinated development in northwest China Research on the relationship between board of supervisors and corporate performance of listed companies in China Research on the relationship between subdistrict office and neighborhood committee in urban China Research on the relationship between organization structure and performance of diversified firms in China