Fluid mechanics is a direction of fluid college. What to learn specifically is based on the guidance of the tutor. Your tutor is engaged in CFD, and you must also do these projects. . . The second interview is very simple, that is, taking an introduction to aerospace. Since I am an airplane major, I can live with my eyes closed. Even if you are not, you can brush the questions all night. If you pass the written test, there will be no problem in the second interview. Of course the score line is true. Let's go to official website, Beihang University.