- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
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
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