单项选择题

角钢采用两侧面焊缝连接,并承受轴心力作用时,其内力分配系数对等肢角钢而言取______,(其中肢背K1;胶尖K2)。
   A.K1=0.7,K2=0.3    B.K1=0.7,K2=0.7
   C.K1=0.75,K2=0.25    D.K1=0.35,K2=0.65

A.K1=0.7,K2=0.3
B.K1=0.7,K2=0.7

C.K1=0.75,K2=0.25
D.K1=0.35,K2