【名词&注释】
网络结构(network structure)、交互式(interactive)、移动电话(mobile phone)、光通信、编码方案(coding scheme)、偏移量(offset)、电话网(telephone network)、会议电话(conference telephone)、不完全(incomplete)、热线服务(hotline service)
[单选题]国际电话网(telephone network)采用三级网络结构，由CT1.CT2和CT3三级国际交换中心和它们之间的长途电路组成，CT1局之间采用（ ）连接。[1分]
A. 网状网
B. 星状
C. 不完全(incomplete)网状
D. 环形
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举一反三：
[单选题]进行有效竞争和（）是市场细分的外在限制条件。
A. 产品的差异
B. 顾客需求的差异
C. 企业资源的限制
D. 环境的差异
[单选题]根据规定，国际长途号码中国家号码由（22）号码组成（不含长途字冠）。
A. 1～3位
B. 1～4位
C. 2～4位
D. 2～5位
[多选题]SDH复用映射结构中的支路单元是一种在低阶通道层和高阶通道层间提供适配功能的信息结构，它由信息净负荷和指示净负荷帧起点相对于高阶VC帧起点偏移量的支路单元指针组成，有（）几种。
A. TU11
B. TU12
C. TU2
D. TU3
[单选题]GPRS网络中CS－2编码方案中1个时隙的数据速率为（B）kbit/s。
A. 8.0
B. 12.0
C. 14.4
D. 20.0
[单选题]处于不同地点的多个用户，通过固定电话、移动电话等通信终端，拨打一个预定的号码以及密码，可实现多方通话，这是（）业务。
A. 缺席服务
B. 热线服务(hotline service)
C. 虚拟网
D. 交互式会议电话(conference telephone)
[单选题]SDH技术本身所采用的光通信的复用方式为（）。
A. 波分复用
B. 空分复用
C. 时分复用
D. 副载波复用
[多选题]【With the 4G telecommunications systems now starting to be deployed,people are looking towards the development of 5th generation or 5G technology services.Although the deployment of any wireless or cellular system take years,development of the 5G technology systems is being investigated.The new 5G technologies will need to be chosen developed and perfected to enable timely and reliable deployment. The new 5th generation,5G technology for cellular systems will probably start to come to fruition around 2020. The current status of the 5G technology for cellular systems is very much in the early development stages.Many companies are looking into the technologies that could be used to become part of the system.In addition to this,a number of universities have set up 5G research units focused on developing the technologies for 5G. In addition, the standards bodies,particularly 3GPP are aware of the development but are not actively planing the 5G systems yet.Many of the technologies to be used for 5G will start to appear in the systems used for 4G and then as the new 5G cellular system starts to formulate in a more concrete manner,they will be incorporated into the new 5G cellular system. The major issue with 5G technology is that there is such an enormously wide variation in the requirements:super fast downloads to small data requirements for IoT than any one system will not be able to meet these needs.Accordingly a layer approach is likely to be adopted.As one commentator stated:5G is not just a mobile technology.It is ubiquitous access to high & low data rate services.】 Based on the paragraph above,at present,5G technology for cellular systems （ ）, many of the technologies to be used for 5G （ ） in the systems used for 4G,the major issue facing with 5G technology is （ ）.
A. has matured
B. has setup its standards
C. is very much in the early development stages
D. is in use A．is being developed
E. already appeared
F. will not appear
G. will start to appear A．super fast downloads
H. small data requirements for IoT
I. 4G system has already satisfied these needs
J. an enormously wide variation in the requirements
[多选题]IP地址129.168.1.1的地址类型是（），其掩码为（）。
A. A类
B. B类
C.
D. C类
F. D类
G. 255.255.255.255 B．255.255.255.0 C．255.255.0.0 D．255.0.0.0
[单选题]目前我国长途电话网(telephone network)主要采用二级网络结构，其中一级交换中心DC1之间以甲结构互连，DC1与二级交换中心DC2之间以乙结构互连，其中（）。
A. 甲是网状网，乙是星状网
B. 甲是星状网，乙是网状网
C. 甲是网状网，乙是复合网
D. 甲是星状网，乙是复合网
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