正确答案:

题目：GPRS提供的点对多点业务可根据某个业务请求者请求，把信息送给多个用户或一组用户，由PTM业务请求者定义用户组成员。（）

解析：√

查看原题

举一反三的答案和解析：

[单选题]下列关于GSM语音质量的说法中，正确的是（ ）。

传输质量在门限值以上时，语音质量水平受传输质量影响不大

[多选题]【A popular service that has attercted the interest of companies and has home users alike is the sending of voice signals over an IP-based network, such as the Internet. The practice of making telephone calls over the internet has had a number of different names, including packet voice, voice over packet, voice over the internet, internet telephone, and Voice over Ip（Voip）. But it appears the industry has settled on the term”Voice ove IP” in reference to the internet protocol, which controls the transfer of data over the internet. There are currently three ways to deliver VoIp to users, the first technique is found at the corporate level. Many companies are offering VoIP systerms that operate over a local area network. These systems involve a fair amount of equipment, such as VoIP servers, special IP-enabled telephones, and routers that can direct telephone calls. Today a large portion of corporate sites have converted their older internal telephone systems to VoIP systems that opreate over a LAN, thus converging two systems into one. A second common solution is the one often encountered at home. Using existing telephones, a special converter is added between the telephone and a high speed internet（DSL or cable modem）connection. The converter digitizes the voice signal and creates a stream of packets that are then sent over an ip connection.The third technique involves smart cell phones. Never cell technologies are all packet-based, thus requiring a telephone call to be converted to digital packets and sending those packets over IP networks.】From the paragraph above，a popular service that has attracetd the interest of companies and home users,is termed as （） . The data transfer over the Internet is controlled by the （） . At corporate level, many companies have replaced their older internal telephone systerms with （） that oprerate over a local area network.

voice over the internet B、voice over packet

Voice over IP

industry

VoIP servers

解析：C,B,A

[单选题]相关群体中有影响力的人物称为（ ）

精神领袖

[多选题]典型的数字信道有（）和无线信道等。

数字微波

同轴电缆

光纤

卫星信道

解析：ABCD

[单选题]互联一方因网内发生路由组织、中继电路、信令方式、局数据、软件版本等的调整，可能影响到对方网的用户通信的，应当提前( )以书面形式向对方通报情况。

15日