4149| 15
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閑來無事做一個小球的動畫 |
點評
誰告訴你水平速度要受到影響的,運動學(xué)都是有假設(shè)的,你的假設(shè)不等于別人的假設(shè)
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點評
不要了。小師妹(姐)后來那段怎么樣了?
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