单项选择题
A.x≧2as’ B.x≦2as’ C.x<2as’ D.x>2as’
A.钢筋 B.受力钢筋 C.架立钢筋 D.箍筋
A.a1fcbx<fyAs B.a1fcbx>fyAs C.a1fcbx=fyAs D.a1fcbx≦fyAs