选课系统主要目的就是利用网络实现教师开课的网络化，学生选课的网络化，教师评定学生成绩的网络化等，提高教师和学生的效率，降低管理的成本-The main purpose of course selection system is the use of networks of teachers commenced the network, a network of student enrollment, teachers assess student achievement of the netwo