Study on the regulation of China's credit rating industry = Study on the regulation of China's credit rating industry Study of price regulation in China's natural monopoly industry Study on the efficiency of Chinese life insurance industry Study on the development of China's marine strategic emerging industries Study on the growth efficiency of China's retail industry Study on the restoration of China ancient ceramics Study on the revitalization of rural industry Study of occupational safety regulation in China's construction industry Study on the construction of regional rural credit rating and credit system