大一新生仅能申请向上升级（如中级转高级），不能申请调换上课时段，或同级数更换授课老师。
Students can apply to upgrade to a higher level, but first-year students are not allowed to change class time or choose lecturers by their own.
以一栋教学楼为例，计算了危险来临时间和周一到周六各上课时段的人员疏散所需时间，分析了教学楼的安全疏散性能。
The danger time and escape times at every class time from Monday to Saturday are computed. The personnel escape performance of that building is investigated as a result.
以一栋教学楼为例，计算了危险来临时间和周一到周六各上课时段的人员疏散所需时间，分析了教学楼的安全疏散性能。
The danger time and escape times at every class time from Monday to Saturday are computed. The personnel escape performance of that building is investigated as a result.
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