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水泥混凝土管有哪些标准孔径啊？ - 工程施工 - 项目管理 - 氿上知道
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满意答案
也就是小于1200的级差是100.
计算时可以这样，实际上，有些孔径的管不一定找得到.
因为不是什么样的管，预制厂都有.
apple1989
回答于：2014-05-27
共2条回答