【名词&注释】
信噪比(snr)、关键技术、误码率、模拟信号(analog signal)、物理层(physical layer)、一段时间(a period)
[判断题]服务营销组合包括产品、价格、渠道、促销、顾客、服务和过程。
查看答案&解析
举一反三：
[单选题]数字数据网DDN是采用（）信道来传输数据信息的数据网。
A. 模拟
B. 传输
C. 数据
D. 数字
[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
[单选题]以下关于接力切换、硬切换、软切换说法错误的是()
A. 接力切换有预同步过程;
B. 硬切换有预同步过程;
C. 硬切换是激活时间到，上下行一起转移到目标小区;
D. 软切换是上下行在原小区和目标小区同时保持一段时间(a period);
[单选题]量化的过程是模拟信号到数字信号的()。
A. 反射
B. 映射
C. 置换
D. 变换
[多选题]TD-MBMS物理层(physical layer)增强关键技术主要包括()
A. UTN宏分集;
B. 联合检测;
C. 随机相位偏转;
D. 人工多径。
[单选题]光纤的传输特性主要包括（）、色散和非线性效应。
A. 误码率
损耗
信噪比
光功率
[单选题]移动通信使用的极低频的波段范围是（）。
A. 100～10mm
B. 10～1mm
C. 100～10kmm
D. 10～1kmm
[单选题]由于SPM随长度而积累，因而是采用G．652光纤的单波长系统的基本非线性损伤，门限功率大约为（ ）dBm。
A. 18
B. 28
C. 38
D. 48
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