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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中
溜溜球地問題.. ? 不須計算
Jun 18th 2013, 20:01

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http://a.imageshack.us/img694/8218/ttz2.jpg 不知道該怎麼"回答題目" ? 這題應該用到力矩觀念...
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