发布时间:2025-02-01 06:56:14
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.
木麻板凳33共齐100角木麻一个3只板凳一个4只角问有多少木麻多少板凳
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