单选题Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）ADUSBline timingCloop timingDinternal timingEthrough timing
单选题
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
参考解析
解析：
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