发布时间:2025-02-08 05:07:35
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.
在中望cad2007标准版中选择不规则形状区域中的对象怎么操作
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