单项选择题
A.622 Mbit/s B.155 Gbit/s C.140 Mbit/s D.2 Mbit/s
A.比特间插 B.奇偶比特效验 C.比特间插奇偶效验 D.奇偶效验
A.A1A1A1A2A2A2 B.A1A2A3A1A2A3 C.A2A2A2A1A1A1 D.A1A2A1A2A1A2
A.STM-4 B.STM-1 C.TU-12 D.AU-3
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