【名词&注释】
数据交换(data exchange)、地级市、本地网(local network)、基本单位(basic unit)、中心城市(central city)、移动电话(mobile phone)、特大城市(megalopolis)、交换网(switching network)、电信业务(telecommunication service)、中继线(junction)
[判断题]转售的基础电信业务(telecommunication service)在向用户销售时使用三大运营商的品牌。
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举一反三：
[单选题]在通信专业中，WDM的英文全称是（85 ），“吞吐量”英文通常翻译为（86）。
A. Wierless Digital Modulation
B. Wave Division Multiplexing
C. Wavelength Division Multiplexing
D. Wireless Data Modulation
[单选题]数字用户环路技术DSL的速率为2B+D，其中的D速率为()，用来传送().
A. 16Kbps，信令及低速数据
B. 8Kbps，信令
C. 16Kbps，信令
[单选题]以下关于X.25分组交换网(switching network)的叙述中，不正确的是（ ）。
A. 在中继线(junction)和用户线上传输时采用逐段独立的差错控制
B. 网络采用固定长度的“信元”作为数据交换的基本单位
C. 网络仅提供虚电路方式的数据通信服务，不提供数据报服务
D. 网络采用存储转发方式，可实现异种速率和类型的终端之间的通信
[单选题]汇接局一般设置在本地网的()并且相互之间采用网状网结构。
A. 特大城市(megalopolis)
B. 大城市
C. 中心城市
D. 地级市
[多选题]【 The Internet ofthings (IoT) is the inter-networking ofphysical devices，vehicles ，buildings ，and other items embedded with electronics ，software，sensors，actuators，and network connectivity which enable these objects to collect and exchange data. In 2013 the Global Standards Initiative on Internet ofThings (IoT-GSI) defined the 10T as " a global infrastructure for the information society， enabling advanced services by interconnecting (physical and virtual) things based on existing and evolving interoperable information and communication technologies" and for these purposes a "thing" is "an object ofthe physical world (physical things) or the information world (virtual things). which is capable ofbeing identified and integrated into communication networks". The 10T allows objects to be sensed or controlled remotely across existing network infrastructure ，creating opportunities for more direct integration of the physical world into computer - based systems，and resulting in improved efficiency. Accuracy and economic benefit in addition to reduced human intervention. When IoT is augmented with sensors and actuators，the technology becomes an instance of the more general class of cyber physical systems，which also encompasses technologies such as smart grids，virtual power plants ，smart homes ，intelligent transportation and smart cities. Each thing is uniquely identifiable through its embedded computing system but is able to interoperate within the existing Intemet infrastructure. Experts estimate that the 10T wi l1 consist of about 30 bi l1ion objects by 2020. 】 Based on the paragraph above，we know that the applications ofthe 10T include (98) . RFID technology makes it possible to automatically (99) every object on the Internet ofthings，and is the foundation ofnetworking. From the industry point of view，IoT is mainly involved in industries including (100).
A. environmental monitoring
B. intelligent transportation
C. energy management
D. all ofthe above
[多选题]移动电话呼叫前转是指用户可根据不同情况设置来电转移到预先设定的（）。
A. 留言信箱
B. 市话
C. 寻呼机
D. 其他手机上
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