vanstone

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光的直线传播
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功和能章概念复习
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温度温度计
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关于滑轮组机械效率的计算
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功和能复习
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人与机械复习
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机械能（二）
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机械能（一）
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功率
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功
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杠杆平衡条件应用二
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杠杆平衡条件应用一
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杠杆
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密度复习（二）
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密度复习（一）
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压强和浮力的复习（二）
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压强和浮力的复习（一）
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测量性实验复习
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运动和力复习（二）
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运动和力复习（一）
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