The principle of drawing lots: all students whose pre-selected courses are less than the class capacity and higher than the starting standard are selected. If the number of pre-selected courses exceeds the class capacity, the system will automatically draw lots according to the course priority.
Drawing lots is a folk custom in China, and it is also one of the forms of divination. Drawing lots is also a lottery. Write down a few beats first, then fold them one by one, disturb the order, and then one or several people smoke. It was first carried out in temples, when the ancients used it to predict good or bad luck.