预应力混凝土轴心受拉构件，抗裂荷载Ncr等于（）
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0720/1595207393738887.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0720/1595207411135986.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0720/1595207425545933.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0720/1595207436782059.png" />
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正确答案： B 答案分析：无
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