There is usually a set time within which you can withdraw from the class, and if you withdraw after that time, it will influence your grade. This period for withdrawal is different at every school.
退课也有一定的时间限制，超过一定时间对你的成绩还是会有影响，各个学校对那个时间限制的要求有所不同。
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.
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。
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