单选题Which timing mode is most appropriate for an ONS 15454 that has lost its BITS-1 and optical references?（）Aline timingBloop timingCinternal timingDthrough timingEexternal timing
单选题
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
参考解析
解析：
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