(一)教学设计 物体的热胀冷缩是一种常见的自然现象.学生很少将这些常见的现象与科学联系在一起,也很少进行这方面的研究。因此在教学中要注意把科学知识的学习与科学方法的学习紧密结合起来。运用实验手段,将热胀冷缩现象展现在学生面前,就更容易看清它的真面目了。因此做好实验是教学的关键,在 (A) the thermal expansion and contraction of teaching design objects is a common natural phenomenon.Students rarely associate these common phenomena with science, and rarely carry out research in this area. Therefore, in teaching, attention should be paid to the combination of learning of scientific knowledge and learning of scientific methods. The use of experimental means, the phenomenon of thermal expansion and contraction in front of students, it is easier to see its true colors. So to do the experiment is the key to teaching