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混凝土的强度等级是根据_来划分的,钢筋混凝土结构混凝土的最低强度等级不应低于_。

时间：2021-09-08 15:39 关键词：青书学堂洛阳理工学院混凝土结构(高起专)

答案解析

立方体抗压强度标准值@#@C20,

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