正确答案: C

C 类用户

题目：一次付费的账号电话卡用户是（ ) 。

解析：C

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学习资料的答案和解析：

[单选题]热爱专业、忠于职责，是科技职业道德的基本原则，是科技人员从事科技劳动的基本的（ ）。

道德要求

[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 （ ）.

is very much in the early development stages

is in use A．is being developed

will not appear

will start to appear A．super fast downloads

4G system has already satisfied these needs

an enormously wide variation in the requirements

解析：C,D,D

[单选题]电信条例规定的电信业务经营者为电信用户提供服务的原则不包括（ ）。

客户满意

[单选题]关于ATM的描述中，错误的是（）。

网络中不进行差错控制，但有流量控制

[多选题]监控系统的基本要求有()等。

监控主机和配套设备应安装在干燥、通风良好的房间

监控主机和配套设备应有良好的接地

监控中心的网络服务器应采用主备用的方式

集中监控系统应具有可扩充性，软、硬件应采用模块化结构

解析：ABCD