Progress and prospect of environmental protection investment in China Research on environmental protection investment in China 并列题名：Research on environmental protection investment in China Progress and prospect of ecological rehabilitation in China Research on promoting enterprise environmental protection investment behaviors Research on development strategy of environmental protection industry in China 并列题名：Research on promoting enterprise environmental protection investment behaviors 并列题名：Research on development strategy of environmental protection industry in China China's report on environmental protection industry policy Principle and design of environmental protection equipment