振动和波是机械运动中比较复杂的一种运动形式．尽管现行的必修教材根据《教学大纲》的要求降低了这一部分知识的难度，把定量讨论的要求放低，只做定性介绍．这样做减轻了学生的负担，但是，如果教师在进行本章教学时对下述的一些问题不阐述清楚，很可能使学生产生误解，影响? Vibration and wave are more complex forms of movement in mechanical movement. Although the current compulsory teaching materials reduce the difficulty of this part of the knowledge according to the requirements of the “syllabus”, the requirements for quantitative discussions are lowered and only qualitative introductions are made. This reduces the burden on students. However, if teachers do not elaborate on the following issues during the teaching of this chapter, it is likely to cause students to misunderstand and influence.