Risk status and prevention and control strategy of water resources in China Research on prevention and control of food safety risks in China 并列题名：Research on prevention and control of food safety risks in China Study on risk mechanism and prevention and control strategy of logistics service supply chain for emergencies Risk prevention and control of water security in urban areas Formation mechanism and control strategies of haze in China Action plan for prevention and control of water pollution Study on green efficiency of water resources in China 并列题名：Study on risk mechanism and prevention and control strategy of logistics service supply chain for emergencies