发布时间:2025-02-01 06:36:54
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.
去深山自己做个小木屋养条狗养只鸡鸭鹅的种点蔬菜喝着泉水烹着茶享受着大自然的风景
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