Academic Research Information (學術研究資訊)
Newspaper: 留園網
Section: 財經·科技·汽車
Title: 科學家揭示粉筆刮擦黑板的聲音為何如此難聽(圖)
Date: 2011/11/03
URL: http://www.6park.com/news/messages/47366.html
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