vanstone

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内能
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分子动理论的基本事实
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升华和凝华
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气化和液化
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探究溶化和凝固
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温度温度计 张洁
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期中复习（二）
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期中复习（一）
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功和能单元复习
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机械能
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测滑轮组的机械效率
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机械功的原理
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功率
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功
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简单机械单元复习
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简单机械单元复习
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滑轮
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滑轮 1
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探究杠杠平衡条件
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杠杆
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