This book introduces students to the concept of sound. How can sounds be heard but not seen? How does sound travel through air and at what rate of speed?
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格式 PDF ● 网页 24 ● ISBN 9781625131959 ● 编辑 Britannica Digital Learning ● 出版者 Britannica Digital Learning ● 发布时间 2014 ● 下载 6 时 ● 货币 EUR ● ID 3323067 ● 复制保护 Adobe DRM
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