Study on regulation of toll road in China 并列题名：Study on regulation of toll road in China Study on the regulation of scenic spots in China 并列题名：Study on the regulation of scenic spots in China study on history of crops in China study on the transfer of rural labor in China Study on the regulation of the capital city in Pre-Qin China studies on regional national autonomy in China Study on IPO regulation of China Study on regulatory institution of public utilities in China