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9 年级科学 NCERT 书籍
9 年级科学 NCERT 书籍
第 1 章 - 我们周围的物质
第 2 章 - 我们周围的物质是否纯净
第 3 章 - 原子和分子
第 4 章 - 原子的结构
第 5 章 - 生命的基本单位
第 6 章 - 组织
第 7 章 - 生物多样性
第 8 章 - 运动
第 9 章 - 力和运动定律
第 10 章 - 引力
第 11 章 - 功和能
第 12 章 - 声音
第 13 章 - 为什么我们会生病
第 14 章 - 自然资源
第 15 章 - 粮食资源的改善

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第 9 章 - 力和运动定律

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