vanstone

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凝结 观察凝结现象 -1
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凝结 分析凝结现象 -2
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光是怎样传播的 -2
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光的折射
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光的反射
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光的传播
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暖和的房间
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物体的热胀冷缩2
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物体的热胀冷缩1
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斜面
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滑轮
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杠杆
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摩擦力
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冰
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给水加热
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