Which timing mode is appropriate for an SDH NE that is adjacent to an SDH NE Bits-1 timing？ （）
- 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 an SDH NE that is adjacent to an SDH NE Bits-1 timing？ （）
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