Study on legal system of administrative certification of work injury in China 并列题名:Study on legal system of administrative certification of work injury in China On the legal system of administrative registration of China Study on legal system of wetland protection and utilization in China Development of administrative litigation theory in China Study on the legal system of administrative substituted fulfillment of environmental obligations 并列题名:Development of administrative litigation theory in China Study on the system of administrative entrustment Study on the system of administrative recourse Study on legal coordination in administrative cooperation for regional economic integration