— What do you think of French?  

— In my opinion, French is _______ English  [ ]

A. a subject so difficult as    

B. as difficult a subject as  

C. as a subject difficult as    

D. difficult as subject as

某装机450MW的坝后水电站内有2500kN/300kN的桥机，桥机轨道梁采用钢筋混凝土T形梁。在进行吊车梁计算配筋时，需要确定T形梁的结构重要性系数γ0，桥机竖向荷载的动力系数γQ，结构系数γd。以下哪一选项是正确的？

A．γ0=1.1，γQ=1.05，γd=1.3

B．γ0=1.0，γQ=1.05，γd=1.2

C．γ0=1.0，γQ=1.2，γd=1.2

D．γ0=1.0，γQ=1.1，γd=1.2