我在上《热胀冷缩》一课，研究“固体是否有热胀冷缩性质”时。感觉到这个实验现象虽然明显，但耗时耗材料。能否设计一个实验，使之收到立竿见影的效果呢？我设计了一个这样的实验来教学这一课。ａ．实验材料：一块平滑木板，兰陵酒瓶内的圆铝片，一根铁条，两根铁钉，酒... I am on the “thermal expansion and contraction” a class to study “whether the solid thermal expansion and contraction properties.” Although the phenomenon of this experiment is obvious, but time-consuming materials. Can design an experiment, so that it received an immediate effect? I designed one such experiment to teach this lesson. a. Experimental materials: a smooth wood, Lanling wine bottle round aluminum, a steel, two nails, wine ...