vanstone

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爱护地球家园
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四季变化
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昼夜交替
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地球
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燃烧和灭火
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二氧化碳
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氧气
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空气的组成
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拓展回顾思考
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噪声与防治
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声音的变化
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声音的传播
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声音的产生
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做个磁控玩具1
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电磁铁
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指南针
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磁铁的性质001
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导体和绝缘体
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点亮小电珠
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电池
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