【单选题】【消耗次数:1】
在局部压力作用下,局部受压区段,产生横向拉应力,当拉应力超过混凝土抗拉强度时,出现纵向裂缝,裂缝一旦出现,“套筒”作用大大( )。
减小
增大
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①  正确
②  错误
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①  正确
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