Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）
- A、DUS
- B、line timing
- C、loop timing
- D、internal timing
- E、through timing
正确答案:B
答案解析:有
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Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）
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