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一个声学演示实验的做法与说明河北玉田二中魏志如九年义务教育初中物理（人教社版）第一册第三章“简单声现象”是新增内容．这部分知识的增设，不仅是初中学生应备的生活知识，更为高中学习“振动和波”打下良好的知识基础，起着重要的衔接作用．因此讲好学好本章知识至...
The practice and description of an acoustic demonstration experiment in Hebei Yutian No. 2 Middle School Wei Zhiru’s nine-year compulsory education junior high school physics (Peach Education Society) Volume I Chapter 3 “Simple Phenomenon” is new. The addition of this part of the knowledge is not only the knowledge of life that junior high school students should prepare, but also a good knowledge base for senior high school students to learn “vibration and wave” and plays an important role in connection. So talk about learning this chapter’s knowledge to...