【名词&注释】
构筑物(structure)、无线通信环境、射钉枪(nail-shotting gun)
[单选题]在下列业务中不属智能网运用的是().
A. 800号业务
B. 300号业务
C. IC卡
查看答案&解析
举一反三：
[单选题]射钉枪射人点距离墙体或构筑物的边缘不得小于()。
A. 5cm;
B. 10cm;
C. 15cm;
D. 20cm
[单选题]在无线通信环境的电波覆盖区内，如何建立用户之间的无线信道的连接，是()接入方式的问题。
A. 专用地址
B. 任何地址
C. 多址
D. 频分
[多选题]按话务控制的对象进行分类可分为()。
A. 电路群控制
B. 路由控制
C. 目的码控制
D. 子路由块控制
[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.
A. voice over the internet B、voice over packet
B. Voice over IP
C. internet telephony A、packet B、internet protocol
D. industry
E. VoIp servers A、VoIP systems B、IP-enablde telephones
F. VoIP servers
G. routers
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