课堂管理案例张老师是化学老师。有一天,当他在指导一项没有危险的实验时,有人叫他到办公室接一个有关他孩子的加急电话。考虑到实验没有什么危险,而且所有真正有危险的材料都锁在柜子里,所以他就让全班学生继续做实验,自己出去接电话了。后来发生的事让张老师既宽心又惊慌:当 Classroom management case Zhang is a chemistry teacher. One day, while he was leading an experiment that was not dangerous, someone called him to the office to pick up an expeditious phone call about his child. Given that the experiment was not dangerous and all the really dangerous materials were locked in the closet, he let the class go on experimenting and went out and answered the phone. What happened later let Zhang is both brooding and alarmed: when