【单选题】【消耗次数：1】
受弯构件正截面承载力计算的依据是适筋梁正截面破坏的（）。
①
第Ⅰ阶段末的应力状态
②
第Ⅱ阶段的应力状态
③
第Ⅱ阶段末的应力状态
④
第Ⅲ阶段末的应力状态
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受弯构件正截面受弯承载力计算中，两类T形截面划分的依据是（ ）。
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