我在教《热胀冷缩》这一课时,强调学生去独立研究问题,发挥教师的主导作用,从大量的感知材料入手,启发学生积极思维。一、创设条件,观察入手,发现问题课前,我为学生准备了细玻璃管、小空瓶,三水(热、温、冷)、煤油、酒精、烧瓶、汽球、酒精灯、火柴,并将这些实验器材分组放在实验桌上。教学开始,我就出示一幅“水壶加热后壶里的水溢出 When I was teaching “Expansion and Contraction”, I emphasized that students should study independently and play a leading role in teachers. Starting with a large amount of perceived materials, I should inspire students to think positively. First, the creation of conditions to observe and start to find problems Before the class, I prepared a small glass tube for students, small bottles, Sanshui (hot, warm, cold), kerosene, alcohol, flasks, balloons, alcohol lights, matches, And these experimental equipment group on the experimental table. Teaching began, I will produce a "kettle heated kettle overflows