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课堂演示实验除了要求重点突出,能见度大,操作熟练,效果明显,确保一次成功外,还要注意培养学生的观察能力,让学生善于在事物和现象中注意到各种极不显著而又非常重要的属性和特性。通过教师的指点,使学生在观察实验中建立起准确的第一印象。要达到这个目的,演示过程中有“五忌”。1 随心所欲,操作不合规范教师在使用仪器、连接和装配仪器及演示现象时动作要准
In addition to the requirements of the classroom demonstration of outstanding experiments, visibility, proficiency in the operation, the effect is obvious, to ensure a successful, but also pay attention to develop students’ observation ability, so that students are good at things and phenomena in the attention of a variety of very significant and very important The properties and characteristics Through teachers’ advice, students can establish accurate first impression in observation experiment. To achieve this goal, there are “five bogey” in the demo. 1 arbitrary, non-standard operation Teachers in the use of equipment, connecting and assembly equipment and demonstration of the phenomenon of action should be quasi