B．luetooth 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。

A．1.95GHz

B．2.45GHz

C．4.45GHz

D．11.45GHz

[主观题]E．volved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification的相关协议为( )

[单选题]A． institutionalB． universalC． fundamentalD． instrumental

[问答题] 什么是HomeRF、SWAP和Bluetooth？

[名词解释] 英译中：Universal Product Code

[名词解释] Radio Beijing

[单选题]In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.A . the outlet of oilB . the outlet of waterC . the bowl peripheryD . the center of bowl

[单选题]试题（71）～（75）A． Bluetooth device can be either a master or a slave and any of the devices within a （71）can be the master. There is only one master and there can be up to （72） active slave devices at a time within a single network. In addition, a device

[单选题]A．s a result of the radio ______for help for the earthquake victims. over a million pounds has been raised.A． appealB． callC． programD． advertisement

[填空题] 接口（interface）是指：（）

[单选题]A user interface can be defined as the combination of hardware and software that helps people and computers (72) with each other.(72) A．intercourseB．intercommunionC．communicateD．intercommunicate