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 picon

题目

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。

A．1.95GHz

B．2.45GHz

C．4.45GHz

D．11.45GHz

相似考题

1.WebSQL is a SQL-like ___(71)___ language for extracting information from the web. Its capabilities for performing navigation of web ___(72)___ make it a useful tool for automating several web-related tasks that require the systematic processing of either all the links in a ___(73)___ , all the pages that can be reached from a given URL through ___(74)___ that match a pattern, or a combination of both. WebSQL also provides transparent access to index servers that can be queried via the Common ___(75)___ Interface.(71)A. query B. transaction C. communication D. programming(72)A. browsers B. servers C. hypertexts D. clients(73)A. hypertext B. page C. protocol D. operation(74)A. paths B. chips C. tools D. directories(75)A. Router B. Device C. Computer D. Gateway

2.In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet.Microwave communication uses high-frequency(71)waves that travel in straightlines through the air. Because the waves cannot(72)with the curvature of the earth, they can be(73)only over short distance. Thus, microwave is a good(74)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or(75). These can be installed on towers, highbuildings, and mountain tops.A．opticalB．radioC．electricalD．magnetic

3.WebSQL is a SQL-like ( 71 ) language for extracting information from the web.Its capabilities for performing navigation of web ( 72 ) make it a useful tool for automating several web-related tasks that require the systematic processing of either ail the links in a (73), all the pages that can be reached from a given URL through (74) that match a pattern, or a combination of both.WebSQL also provides transparent access to index servers that can be queried via the Common (75) Interface.A.queryB.transactionC.communicationD.programming

4.WebSQL is a SQL-like （71） language for extracting information from the web. Itscapabilities for performing navigation of web （72） make it a useful tool for automatingseveral web-related tasks that require the systematic processing of either all the links in a（73） , all the pages that can be reached from a given URL through （74） that match apattern, or a combination of both. WebSQL also provides transparent access to index servers thatcan be queried via the Common （75） Interface.（71）A. query B. transaction C. communication D. programming（72）A. browsers B. servers C. hypertexts D. clients（73）A. hypertext B. page C. protocol D. operation（74）A. paths B. chips C. tools D. directories（75）A. Router B. Device C. Computer D. Gateway

更多“Bluetooth is a universal radio interface in the(71)frequency hand that enables portable el ”相关问题

  • 第1题：

    OFDM的英文是()

    A.OverloadFrequencyDivisionMultiplexing

    B.Orthogonal?Frequency?Division?Multiplexing

    C.Overwhelming?Frequency?DivisionMultiplexing

    D.Outstanding?Frequency?Division?Multiplexing


    正确答案：B

  • 第2题：

    ●This printer is equipped with an 8-bit parallel (71) port for PCs.

    (71)

    A. plug

    B.insert

    C.link

    D.interface


    正确答案：D
    参考译文
    这种打印机配有一个可与微机连接的8位并行口。
    参考答案
    (71)D

  • 第3题：

    A collapsible operating table was provided in his medical team.

    A:clean
    B:colored
    C:folded
    D:portable

    答案：C
    解析：
    本句意思：“在他的医疗小组里提供了一个可折叠的手术台。”folded：折叠的，例如：I folded the letter and then put it into the envelope．我把信折好后放进信封里。 clean：干净的，例如：The metro is efficient and spotlessly clean．地铁非常快捷，而且一尘不染。 colored：有色的，彩色的，例如：Some enjoy having sets of tiny colored pictures．有些人喜欢成套的各种颜色的微型图画。portable：便携式的，例如：I always carry a portable computer with me.我总是随身携带一台手提电脑。

  • 第4题：

    ●This printer is equipped with an 8-bit parallel (71) 一 port for PCs.

    (71)

    A. plug

    B.insert

    C.link

    D.interface


    正确答案：D

  • 第5题：

    Since tablet computers and smart phones have（71）interface, many people believe that all home and business computers will eventually have this kind of interface too.

    A.CRT
    B.LED
    C.Touch-screen
    D. Large screen

    答案：C
    解析：
    由于平板电脑和智能手机配有触摸屏界面，许多人相信，将来所有家用电脑和商用电脑最终也都会配置这类接口。

  • 第6题：

    在无线局域网WLAN中普遍采用802.11b和802.11g无线传输技术，而非Bluetooth技术的原因是：

    A．802.11传输技术的误码率比Bluetooth低

    B．802.11信号传输距离比Bluetooth远

    C．802.11标准比Bluetooth标准出现得早

    D．802.11无线信号可以绕过障碍物的能力比Bluetooth强

    E．802.11传输技术的数据传输速率比Bluetooth低


    802.11 信号传输距离比 Bluetooth 远

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