A.≤1m,≤02m B.≥1m,≥02m C.≤2m,≤02m D.≥2m,≥02m
A.5,1 B.4,1 C.5,0.5 D.4,0.5
A.64Kbit/S B.13Kbit/S C.14Kbit/S D.14.4Kbit/S