如何在课堂教学中合理地利用课时45分钟,是反映一个教师课堂教学水平的一个重要标尺。每一个学科的教学任务,就是教师充分利用该学科每节课的课堂教学时间即课时,并与学生共同活动来完成的。而课时中包含有多个更短的课堂教学时段。然而,课时的非合理利用包括有形的损失和无形的浪费两种。有形的损失是由教师的主观和客观造成的,如迟到、早退、突发性事件和在课堂教学中“放野马”。而无形的浪费是由于课时组织结构安 How to use class 45 minutes reasonably in class teaching is an important measure to reflect a teacher’s class teaching. The task of teaching in each discipline is that teachers should make full use of the classroom teaching time of each course of the discipline, that is, the class hours, and accomplish the activities together with the students. Lesson hours include more shorter classroom sessions. However, the irrational use of class hours includes tangible loss and invisible waste. Tangible loss is caused by the subjective and objective teachers, such as late, early leave, sudden incidents and classroom teaching “release Mustang ”. The intangible waste is due to class structure and security