求翻译：size of 15 nm were partially added to concrete with the optimum content of ground granulated blast furnace slag and physical是什么意思？

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悬赏分：1 - 离问题结束还有

size of 15 nm were partially added to concrete with the optimum content of ground granulated blast furnace slag and physical

问题补充：

匿名	2013-05-23 12:21:38 15纳米大小的部分添加到混凝土地面粒状高炉矿渣和身体的最佳内容

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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