单项选择题
A.5.26% 4.61% B.4.85% 4.61% C.5.26% 4.93% D.4.85% 4.93%
A.7.79次,4.5次 B.9.8次,4.5次 C.7.97次,7.6次 D.9.8次,7.6次
A.32% B.31.6% C.26% D.25.5%