are non capable of being regenerated. A: Solar cell B: Nonrenewable materials C: Hydrogen fuel cell D: Wind energy
are non capable of being regenerated. A: Solar cell B: Nonrenewable materials C: Hydrogen fuel cell D: Wind energy
中国大学MOOC: 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: 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.
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