This is different from school to school. You can go to China Graduate Admissions Information Network for details. Or you can ask some teachers for advice. When I first started preparing for the postgraduate entrance examination, I knew nothing about it. I asked all the questions and consulted Pan Pan, a teacher from heaven. In the end, this poor little sister was tortured by me. She said that if you study the website, you can find many basic common sense questions. Call me if you don't understand anything else, hahaha. ?
But thank you for telling me a lot. I'm almost an expert. After running back, the research direction behind environmental engineering is nothing more than soil problems, water pollution problems or air pollution problems. ?
I'll give you a picture, taking Nanjing University of Science and Technology as an example:
These are its research directions. You can enter any school you want.