单项选择题
A.e0为0.55 m,e0<0.75ρ B.e0为0.55 m,0.75ρ<e0<ρ C.e0为0.72 m,e0<0.75ρ D.e0为0.72 m,0.75ρ<e0<ρ
A.177.8% B.146.9% C.112.3% D.45.7%