If node 2 is accepting line timing from node 1, node 2 will send （）to node 1 as its SSM message.
- A、ESF
- B、PRS
- C、DUS
- D、SMC
- E、B8ZS
正确答案:C
答案解析:有
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If node 2 is accepting line timing from node 1, node 2 will send （）to node 1 as its SSM message.
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