单项选择题
A.0,50%,100% B.0,25%,50%,75%,100% C.0,25%,75%,90%,100% D.0,50%,75%,90%,100%
A.99.5 B.99.8 C.99.9 D.99.95
A.1 B.5 C.10 D.500