判断题

泛音共鸣管，即整个咽腔，包括鼻咽腔、口咽腔、喉咽管。泛音共鸣管可使歌声增加圆润、浑厚的低频音色。
A、正确
B、错误

【参考答案】

正确

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

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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

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