A.5.6Kbit/s B.6.6Kbit/s C.7.6Kbit/s D.8.6Kbit/s
A.fl(n)=890.2MHz+(n-1)×0.2MHz B.fl(n)=890.2MHz+(n+1)×0.2MHz C.fl(n)=890MHz+(n-1)×0.2MHz D.fl(n)=890MHz+(n+1)×0.2MHz
A.57 B.75 C.47 D.74