单项选择题

Which timing mode is most appropriate for an ONS 15454 that has lost its BITS－1 and optical references?（）

A.line
B.loop
C.internal
D.through
E.external
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单项选择题
You are provisioning a DS-1 circuit on an ONS 15454 2F-BLSR with a XC-10G carD.Each VT1.5 connection must also terminate via the STS matrix. On the originating circuit node, how many STS ports are now available for VT1.5 circuits?（）A.2B.3C.4D.20E.22F.24
A.5
B.5
C.2
D.3
E.4
F.20
G.22
H.24
单项选择题
真丝绸染整加工流程是（）。①染色 ②漂白 ③精炼 ④后整理 A、①→②→③→④ B、②→③→④→① C、③→②→①→④ D、②→③→①→④
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