正确答案: B

帧中继

题目：对所传递信息透明传输的交换方式主要应用与（）

解析：B

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举一反三的答案和解析：

[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

[多选题]数字卫星通信方式有（）。

数字话音插空的时分多址

不加话音插空的时分多址

星上交换时分多址

卫星数字通道方式

解析：ABCD

[多选题]手机将含有手机使用业务种类（）发送给MSC，MSC判断手机是否有权呼出，呼出限制可由用户或运营商激活。

话音

数据

传真业务

被叫号码的呼叫建立信息

解析：ABCD

[单选题]光检测器是光接收机的核心部件，需满足响应度高，（）和响应速度快等要求。

噪声低

[单选题]近年来，微博、微信等新型交流方式发展迅速，他们都是典型的()融合的产物。

移动网和互联网

[多选题]客户需求调查主要包括（）等方面。

价格敏感度

业务宣传影响度

购买数量

购买者心里效应

解析：ABCD