option out of no option, choice is about relativity

来源: zhmz888 于 2011-03-12 04:05:01 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (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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