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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.

钢筋混凝土预制桩与桩尖位于坚硬土层时,打桩的控制标准以( ) 为主,以() 作为 参考.

护筒的作用是()

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