一棵樹可以做多少包衛生紙 - 社會議題
By Suhail Hany
at 2010-02-25T00:00
at 2010-02-25T00:00
Table of Contents
我想做一個小小的計算一棵樹可以做多少包衛生紙呢(樹齡大約20年的)還有一棵樹(20年)一個月能吸收多少2氧化碳呢
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社會議題
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By Eartha
at 2010-02-26T10:45
at 2010-02-26T10:45
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