题目内容

砂子的粗细程度,影响砼性能,当细度模数为()mm时该砂子是粗砂。

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砂和石的坚固性都是用()溶液法检验的。

在砼拌合过程中掺入的,并能按要求改善砼性能,一般情况掺量不超过水泥质量的5%的材料,统称( ).

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1.预制桩强度达到( ) 设计强度时,方可起吊堆放,预制桩强度达到()设计强度时方 可运输.

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