What does the pre-selection of Sichuan University mean?

That is, you choose first and choose what you want. Then the educational administration system draws lots for the full class. If you draw, you will be selected. If you don't draw, you don't choose. There is no limit to this pre-selected course. Don't rob it.

The election is coming. If there are still some places for good courses and popular courses, you have to grab them if you want to choose. This is the order, first come, first served. By-election is similar to withdrawal and direct election, but you can still withdraw from the election if you feel bad after participating.