《物体的热胀冷缩（一）》是九年义务教育五年制小学自然（人教版）第六册中的教材，它与《物体的热胀冷缩（二）》、《温度计》、《测定物体的温度》三课构成第六册教材的“热”教学单元。本课的课型从教材内容分析，是属于认识自然变化规律的中心内容的课型。在教学中，应着? “The object of thermal expansion and contraction (a)” is a nine-year compulsory education five-year primary school nature (PEP) sixth volumes of teaching materials, it “with the object of thermal expansion and contraction (two)”, “thermometer” , “Determination of the temperature of the object,” the three lessons constitute the sixth book “hot” teaching unit. The course type from the textbook content analysis, is a course of understanding of the law of the nature of the content of the type of course. In teaching, should?