【单选题】【消耗次数：1】
在钢筋混凝土构件的挠度计算时，《混凝土结构设计规范》建议其刚度应取（）
①
在同号弯矩区段内取弯矩最大截面的刚度
②
在同号弯矩区段内取弯矩最小截面的刚度
③
在同号弯矩区段内取最大刚度
④
在同号弯矩区段内取平均刚度
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下面的关于钢筋混凝土受弯构件截面弯曲刚度的说明中，错误的是
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截面弯曲刚度随着荷载增大而减小
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截面弯曲刚度随着时间的增加而减小
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截面弯曲刚度随着裂缝的发展而减小
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截面弯曲刚度不变
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