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问题 单项选择题

互联网专线业务网络结构模型（）。

A.集团客户内部网络-CMNET城域网-CMNET骨干网-互联互通出口-其他运营商

B.集团客户内部网络-CMNET骨干网-CMNET城域网-互联互通出口-其他运营商

C.集团客户内部网络-互联互通出口-其他运营商-CMNET城域网-CMNET骨干网

D.集团客户内部网络-CMNET城域网-CMNET骨干网-其他运营商-互联互通出口

答案

参考答案：A

单项选择题

胎儿窘迫的早期表现是（）

A.胎动消失

B.胎动减弱

C.胎动频繁

D.胎动增强

E.胎动次数减少
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单项选择题

Frame Relay is simplified form of (51) , similar in principle to (52) , in which synchronous, frames of data are routed to different destinations depending on header information.

Packets are routed throught one or more Virtual Circuits known as (53) . Most Virtual Circuits are (54) , which means that the network provider sets up all DLCI connections at subscription time. (55) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.

（53）是（）

A.DLCIs

B.HDLCs

C.SDLCs

D.DLs
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