“教学大纲”中明确指出:教学中要重视概念和规律的建立过程,要切实培养提高学生的理解能力。要通过观察现象,观看演示和学生自己做实验,培养学生的观察能力和实验能力。要 “Syllabus ” clearly pointed out: teaching should pay attention to the process of the establishment of concepts and laws, to effectively cultivate and improve students’ understanding. To observe the phenomenon, watch the demonstration and the students themselves to do experiments to cultivate students’ observation ability and experimental ability. want