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Valmai Wynn
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385 Presentations
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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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