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【单选题】
混凝土结构的裂缝控制等级分为三级,以下关于裂缝控制等级的说法哪一个是错误的()?
A.
一级,要求在荷载标准组合下,受拉边缘不允许出现拉应力
B.
二级,要求在荷载标准组合下,受拉边缘可以出现拉应力,但拉应力值应小于混凝土的抗拉强度设计值
C.
二级,要求在荷载准永久组合下,受拉边缘不允许出现拉应力
D.
三级,允许出现裂缝,但最大裂缝宽度应满足要求
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