在一次教研活动中,有三位老师分别执教了《探究马铃薯沉浮的原因》这节科学课。这课主要是让学生能明白物体的沉浮与相同体积液体的轻重有关。听课后我感触很深,我认为要想做到实验的有效性应该做到实验材料准备齐全,会规范地使用仪器,教师下水实验应必不可少,学生自主探究不可被剥夺,这样才能达到科学实验更有效的目的。 During a teaching and research activity, three teachers coached the science class, “Investigating the causes of potato ups and downs.” This lesson is mainly for students to understand that the ups and downs of an object are related to the severity of the same volume of fluid. After class I feel very deep, I think in order to achieve the effectiveness of the experiment should be prepared to complete the experimental material will be standardized use of equipment, teachers should be indispensable in launching experiments, students can not be exploited to explore, so as to achieve science Experiment more effectively for the purpose.