Ecological risk assessment and management of disasters in typical regions 并列题名：Ecological risk assessment and management of disasters in typical regions Risk assessment and management of natural disasters in scenic areas Research on risk assessment and management of grain planting industry in China Research on risk assessment and management of China's outward foreign direct investment Ecological risk assessment and early warning of heavy metals in river Risk assessment and management of social stability 并列题名：Risk assessment and management of social stability Fire risk assessment and management on the ancient brick-wood buildings