Study on the independent director system of listed firms in China Study on the validation of independent director system of listed company in China 并列题名:Study on the validation of independent director system of listed company in China Study on earnings conservatism of listed firms in China Study on the Independent Director System Survey on the independent innovation of non-state-owned enterprises in China Research on the issue of high-interest entrusted loans of the listed firms in China Research on the independent director system、corporate governance behaviors and incentive mechanism