教学计划编制问题，程序实现两种编排策略：1使学生在各学期的学习负担尽量均匀；2是使课程尽量集中在前几个学期中-Teaching planning issues, program scheduling two strategies: one to enable students to learn as much as possible the burden evenly in each semester 2 is to try to focus on the course in the firs