【单选题】Taiwan—born film-- maker Ang Lee won the Oscar for best Director at the 78 th Academy Awards, _______ the highest honour in American movie fields.
【简答题】已知安全等级为Ⅱ级的装配预应力混凝土简支T梁,截面尺寸及配筋如图2-12-10所示,计算跨径为29.14m。跨中截面承受计算弯矩M d =7600kN·m;C50混凝土;预应力钢筋采用8束24 5消除应力光面钢丝束,A p =3768mm 2 ;f pk =1670MPa。不计非预应力钢筋。验算跨中正截面抗弯承载力。