vanstone

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降落伞
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制作机器模型
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自行车的结构与行驶
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自行车的发明与发展
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微生物技术(二)
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微生物
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显微镜的发明与发展
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拓展 回顾 思考（）
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山地河流的考察
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动植物的考察
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有趣的科学考察活动
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变化的星空 周大为
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地表的变化
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地震和火山
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《地壳的运动》
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各种各样的运动
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人体的运动
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动物的运动
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植物的运动
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制作生物生存环境的模型
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