Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and optical references?（）
- A、line timing
- B、loop timing
- C、internal timing
- D、through timing
- E、external timing
正确答案:C
答案解析:有
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Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and optical references?（）
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