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关注：1
2013-05-23 12:21
求翻译：as a by-product of burned coal,fly ash requires no additional expenditure of energy to be produced,where cement production requires great amounts of energy.是什么意思？ 待解决
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as a by-product of burned coal,fly ash requires no additional expenditure of energy to be produced,where cement production requires great amounts of energy.
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