A.16:9
B.13:11
C.7:4
D.4:3
[单选题]A.16:9B.13:11C.7:4D.4:3
[单选题]A.18%B.16%C.15%D.7.5%
[单选题]A.B.C.D.
[单选题]A.B.C.D.不能确定