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一、教材分析及教学目标: 《冷和热》是苏教版《科学》教材中的第二单元。本单元共安排了《它有多热》《热住哪里传》《哪种材料传热快》和《热水变凉》四节内容。“冷”和“热”属于“物质世界”部分“热现象”的内容。冷和热是能
First, the textbook analysis and teaching objectives: “cold and heat” is the second unit of the textbook of the Soviet version of “science”. This unit arranges four sections such as “How hot is it”, “Where is the heat?”, “What kind of material is fast heat transfer” and “Hot water is cool”. “Cold” and “hot” belong to the “hot phenomenon” in the “material world”. Cold and heat can be