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› Very cheap ( $15-40 ) solar collector-concentrator that does not need a tracker
peterchanchun
發表於 2021-5-1 18:32:49
Very cheap ( $15-40 ) solar collector-concentrator that does not need a tracker
Very cheap ( $15-40 ) solar collector-concentrator that does not need a tracker
https://www.youtube.com/watch?v=iJCfsqvEx1w
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Very cheap ( $15-40 ) solar collector-concentrator that does not need a tracker