正确答案: AD

同步方式 准同步

题目：复接的同步方式是指参与复接的各支路之间的相对关系，主要分为（）方式。

解析：AD

查看原题

举一反三的答案和解析：

[单选题]反映电信的基本特点和工作标准，同时又反映社会和人民群众对电信基本要求的是（）。

迅速、准确、安全、方便

[单选题]保护间隔中的信号与该符号尾部相同，即循环前缀(CyclicPrefix,简称CP)，其作用()

仅用于消除多径ISI

[单选题]ISDN的出现.受益的是().

以上两者都是

[多选题]4G is one of those terms that keep coming back through marketing brochures for what the latest technologies happen to be in the cellphone market. Every carrier claims to have true 4G, and has been claiming that for years, regardless of what they actually use. The reason was simple because the real 4G specification, expected to be drafted by the International Telecommunication Union, was no where to be found. In fact, the ITU took way longer than being expected to come up with a decision, likely because of massive lobbying campaigns. After all, which company wants to have to redesign its entire network just to be able to keep saying they are 4G? Now however, they ITU has decided itself.What does this mean for carriers and users? First，let’s see what 4G really is. As expected, LTE is central to the ITU strategy,but more precisely,the organization went with LTE-Advanced,which is a stricter version of traditional LTE. To qualify as 4G，a network has to provide 100Mbps connections over wireless,and 1 Gbps over wired. The whole network has to be fully IPv6 compliant. Frequencies have to be variable over 40MHz to avoid interference. Finally, global roaming has to be seamless, along with transitions between wirless and wired connections. This is a real step forward, and a good decision, which ensures that real 4G services will meet a good level of services. Technically, LTE-Advanced is just one of two new standard that are now under the umbrella called IMT-Advanced. The other one is WiMAX 2 which is a further refinement of the WimMAX protocol. Based on the paragraph above，to qualify as 4G, a network has to satisfy （） criteria. The transitions between wireless and wired connections have to be （）. LTE-Advanced is a standard belonging to （）.

four

five A．limited

seamless

deployed A．WiMAX

IPv6

IMT-Advanced

解析：D,C,D

[单选题]营销案例的特点不包括（）

实效性

[单选题]DCI格式1用于调度:

一个PDSCH码字

[多选题]静止型不间断供电系统具有（）等优点。

体积小

重量轻

噪声小

可靠性高

解析：ABCD

[单选题]GPRS网络CS-3编码方案2个时隙数据速率为()kbit/s。

28.8

[单选题]当前我国中央层面的电信主管部门是（）。

工业和信息化部