A.20
B.24
C.27
D.31
[单选题]:2,5/3,3/2,7/5,( )A.7/5B.5/6C.3/5D.4/3
[单选题]:2,5/3,3/2,7/5,( )。A. 7/5B. 5/6C. 3/5D. 4/3
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12
[单选题]2/3,1/2,5/9,( ),11/15。A.2/5B.6/11C.3/4D.7/12