发布时间:2025-02-01 06:57:40
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.
有好多过期的茶叶想做一个枕头很多人说要用泡过的好请专家指导下
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