關於陀螺原理 - 自行車
By Cara
at 2005-06-17T00:00
at 2005-06-17T00:00
Table of Contents
陀螺為什麼會旋轉..?重要原因是在於那條繩子ㄇ?原理是?
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自行車
All Comments
By Una
at 2005-06-19T14:25
at 2005-06-19T14:25
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