单项选择题
A.9.7(Ⅳ) B.12.2(Ⅳ) C.15.5(Ⅳ) D.24.8(Ⅴ)
A.24m/d B.12m/d C.6m/d D.3m/d
A.436.78m-2 B.458.62m-2 C.161.77m-2 D.135.88m-2