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  1. chap09

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  2. Renewable energy can be defined initially as any energy source that is derived directly or indirectly solar energy. In the broadest sense, however, almost all of the energy we use today, including fossil fuels, can be considered a form of solar
  3. 所属分类:文件格式

    • 发布日期:2025-07-21
    • 文件大小:65536

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