1. As everyone in the industry knows, Tsinghua, Harbin Institute of Technology and Tongji are the best majors in water supply and drainage. The four schools you mentioned, the difficulty: Tongji > Harbin Institute of Technology > Wuhan University > He Hai. Except Jianghai, the first three schools are not easy to test. The water supply and drainage of Wuhan Institute of Technology is better than that of Wuhan University. If you take the exam, you only need the national line, and Beijing industry is not difficult to take the exam.

2. Harbin Institute of Technology: Analytical Chemistry of Water, Tongji: Analytical Chemistry of Water, Wuhan University of Technology: Hydraulics, Water Analysis and Hydraulics. Beijing industry and rivers and seas are said to be water quality analysis and hydraulics, so I don't remember them clearly.

This is the engineering line announced by each school. I suggest you go to the Sina Education Postgraduate Entrance Examination Zone to check for yourself. /kaoyan/ this was easy to look up, but it was difficult for me to type it. Excuse me!

PS: I suggest you try your best to get into a good university according to your own strength. Although there are risks, after all, postgraduate entrance examination is easier than college entrance examination, and it can also improve your grades, especially for students who have made up their minds to take an examination of other schools.