发布时间:2025-02-01 06:59:07
C40的立方体抗压强度标准值(在标准养护条件下养护达到28D龄期,用标准方法测得的极限抗压强度)为40MPa.
今年刚毕业想去北京找工作不知道北京哪一块有便宜一点的房子大概在200500左右谢谢
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