【单选题】【消耗次数:1】
检验评定混凝土强度时,应采用()或()的标准养护试件。
7d;28d
28d;设计规定龄期
14d;28d
7d;设计规定龄期
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①  正确
②  错误
【判断题】 通常混凝土以28天龄期评定强度等级,也就是说,混凝土经过28天龄期后其强度便停止发展了( )。
①  正确
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