单项选择题
A.63 B.64 C.252 D.1008
A.1 B.4 C.16 D.64
A.2.048Lfbit/s B.8.448Mbit/s C.34.368Mbit/s D.139.264Mbit/s
A.复用段开销 B.通道开销 C.同步开销 D.校验字节
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