option out of no option, choice is about relativity

來源: zhmz888 於 2011-03-12 04:05:01 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (192 bytes)

nuclear energy is well recognise 'clean' energy beside solar energy（light and wind);

hydrolic is widely accepted a none clean energy due to the intangible cost to enviroment...

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