A.4800bit/s B.2400bit/s C.9600bit/s D.14400bit/s
A.1 B.1/2 C.1/4 D.1/8
A.抗干擾能力強(qiáng) B.可以時(shí)分復(fù)用 C.便于構(gòu)成綜合業(yè)務(wù)網(wǎng) D.占用信道帶寬窄