单项选择题
A.εs>εy,εc=εcu B.εs<εy,εc=εcu C.εs<εy,εc>εcu D.εs>εy,εc>εcu
A.97.5kN B.106.25kN C.110.0kN D.93.75kN
A.①③ B.①② C.①②③ D.①②③