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一、防患于未然,消除能预测的安全隐患1.科学教师上课前除了备教材、备学生外,还要考虑学生准备材料是否安全以及教学环境中可能存在的安全隐患。笔者曾在参加省科学自制教具竞赛时,对一位教师设计的自制火箭印象很深,教师演示时,实验效果很好,实验现象比较明显,但由于反冲力很大,实验时存在很大的安全隐患。因此教师在选择实验材料时,除了考虑材料的效果外,还要充分考
First, take preventive measures to eliminate potential safety hazards 1. Science teachers in addition to prepare teaching materials before class, prepare students, but also consider the safety of students to prepare materials and teaching environment may exist in the security risks. I participated in the provincial science self-teaching aids contest, the design of a teacher self-made rocket impressed, the teacher demo, the experimental results are good, the experimental phenomenon is more obvious, but due to a large recoil force, the experiment there is a big Security risks. Therefore, teachers in the choice of experimental materials, in addition to considering the effect of materials, but also full test