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> 中国大学MOOC答案 > 4. It refers to a kind of economy, in which materials are regenerated and constantly flow around a “closed loop” system, rather than being used a few times and then discarded.

4. It refers to a kind of economy, in which materials are regenerated and constantly flow around a “closed loop” system, rather than being used a few times and then discarded.

中国大学MOOC答案 数据帝 2024-05-08 扫描二维码
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