单项选择题
A.0 B.25‰ C.100‰ D.50‰ E.不能从所给资料中求出
A.82.6% B.27.5% C.20.6% D.15.0% E.19.0%
A.4.89 B.10.52 C.7.33 D.5.75 E.0.13