用市场上出售的儿童玩具“妙妙圈”(又称彩虹圈),可以自制纵波演示仪等,其可见度高,效果明显,且因材料来源于玩具,能极大地提高学生的兴趣,加深对所学知识的印象。1 制作材料 妙妙圈1个,木条数根,废锯条一条(或钢丝一根),螺丝帽一个。2 制作方法 With the children’s toys “Miu Miu Quan” (also known as the Rainbow Circle) sold on the market, you can make P-wave demonstration instruments, etc. The visibility is high and the effect is obvious. Because the material comes from toys, students’ interest can be greatly improved. Impression of what you learned. 1 Making materials One Miu Miu circle, a few wooden sticks, one saw blade (or one steel wire), and one screw cap. 2 production methods