题目内容
计算弯矩系数αM，计算轴力系数ηn与下列______组数据最为接近。
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设屋面梁的纵向受拉钢筋为3Φ8，按荷载标准组合下钢筋的应力σss=162N/mm2，则屋面梁的短期刚度Bs最接近______项数值。
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