A.48 B.48.0/10萬(wàn)-25.4/10萬(wàn)=22.6/10萬(wàn) C.48.0/25.4=1.89 D.(48.0-25.4)/48.0
A.0.17% B.33.33% C.0.33% D.0.05%
A.1.25 B.1.6 C.16 D.160