题目内容

砂和石的颗粒是()mm为界的。

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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。

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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