Wednesday, 18 March 2015

重心的奧秘密密密!!!!!

讓我們看看重心的奧秘!!!!
http://scigame.ntcu.edu.tw/power/power-015.htm
圖片來源:zfangの科學小玩意::從平衡鳥到學生的搞怪"鳥"
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