A.
B.
C.S>4
D.S<4
[单选题]A.13B.12C.14D.11
[单选题]A.13B.12C.14D.11
[单选题]A.B.C.S>4D.S<4
[单选题]A.26.65%B.27.42%C.27.96%D.28.85%
[单选题]A.20,30AB.20A,21.2AC.28.28A,30AD.28.28A,21.2A
[单选题]A.20,30AB.20A,21.2AC.28.28A,30AD.28.28A,21.2A
[单选题]A.A>BB.A<BC.A=BD.不能确定