A.4800bit/s B.6400bit/s C.7200bit/s D.9600bit/s
A.模擬信號(hào) B.數(shù)字信號(hào) C.調(diào)相信號(hào) D.調(diào)頻信號(hào)
A.成正比 B.成反比 C.相等 D.無關(guān)