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生活小贴士 梨汁变色 -3
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用化学保护你的安全 电火
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感受微观世界 爱动的分子
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感受微观世界 小小的原子 -1
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感受微观世界 多样的分子
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走进现代农业园 筛选榛子
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走进污水处理厂 区分三种水 -1
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奇妙的干冰 干冰的升华
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