人力發電的可行性 - 自行車
By Daph Bay
at 2014-05-06T00:00
at 2014-05-06T00:00
Table of Contents
如果一個人每天發電一塊錢一天就有兩千萬的電費一個月6億一年72億這樣不無小補吧(當然兩千萬人可能太多但也不一定是一塊錢)
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自行車
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By Todd Johnson
at 2014-05-10T11:15
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