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本课实验可以利用的材料比较多,要求因地制宜、就地取材,特别是利用身边的材料自制教具,培养学生的实验能力和对实验中发生的现象进行分析和概括的能力。本课
This experiment can take advantage of more materials, require measures suited to local conditions, local materials, especially the use of materials around the homemade teaching aids to develop students' ability to experiment and the phenomenon occurred in the experiment analysis and summary capabilities. This lesson