2. 计算机
  3. Bluetooth is a universal radio interface in the(71)frequency hand that enables portable electronic devices to connect and commun

Bluetooth is a universal radio interface in the(71)frequency hand that enables portable electronic devices to connect and commun

admin2012-03-08  42
问题 Bluetooth is a universal radio interface in the(71)frequency hand that enables portable electronic devices to connect and communicate wirelessly via short-range, ad hoc networks. Each unit can simultaneously communicate with up to(72)other units per piconet. Moreover, each unit can simultaneously(73)to several piconets. Eliminates the need for wires, cables and connectors for and between cordless or mobile phones, modems, headsets, PDAs, Computers, printers, projectors, local area networks, and so on, and paves the way for new and completely different devices and applications. Technology Characteristics(74)symbol rate exploits maximum available(75)bandwidth。
选项 A、messages
B、certificates
C、applets
D、channel
答案D
解析 蓝牙是一个频率为2.45GHz的通用无线电通信接口，它通过一个特殊的网络可以在各种便携设备之间建立起无线连接并进行短程通信。在一个微型网中，每个单元都能同时与其他各单元进行通信。而且，每一个单元可以同时属于几个微型网。其目的是为了免除在无绳电话或移动电话、调制解调器、头套式送/受话器、PDAs、计算机、打印机、幻灯机、局域网等之间加装电线、电缆和连接器。而且，这种技术可以延伸到那些完全不同的新设备和新应用中去。“蓝牙”的技术特性——以每秒1兆码元的字符速率传输，充分利用信道的最大有效带宽。
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