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Valmai Wynn
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385 Presentations
United Kingdom
Joined 02/07/2012
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被举高的粉笔具不具有能量？为什么？ 当粉笔头下落的过程中，粉笔头具不具有什么能量？ 那么在下落过程中和起始位置比较，粉笔头的重力势能和动能各有什么变化？
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최고 VS 최악
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