What is an advantage of an externally modulated laser over a directly modulated laser?()A. lower costB. higher chirpC. easier to manufactureD. higher dispersion toleranceE. higher optical signal-to-noise ratio

题目
What is an advantage of an externally modulated laser over a directly modulated laser?()

A. lower cost

B. higher chirp

C. easier to manufacture

D. higher dispersion tolerance

E. higher optical signal-to-noise ratio

相似考题

1.The Smart Color Laser Copier is comparable ()professional editing.A.toB.onC.at

2.Now it is clear that laser light has () applications.A.dangerousB.coherentC.mysteriousD.numerous

3.Whichofthefollowingprintersprintsmulti－partformsatonce?()A.inkjetB.thermalC.impactD.laser

4.No more than twenty years passed ( ) laser was first invented.A、afterB、sinceC、beforeD、when

参考答案和解析
参考答案：D
更多“What is an advantage of an externally modulated laser over a directly modulated laser?() ”相关问题

  • 第1题：

    Why do the American doctors think of using laser light to treat heart disease?

    A．Beeause laser light is quite powerful．

    B．Because laser light is penetrating．

    C．Because laser light can destroy the blocking materials in human’s artery．

    D．Because laser light can travel through the human body．


    正确答案：C
    根据文章第二段开头一句，可知激光能够清除动脉里的脂肪物质，因此答案应是C项。

  • 第2题：

    What’S the main idea of the passage7

    A．Laser light treatment of heart disease should take the place of the traditional operatlon．

    B．Laser light treatment has been proved better and more effective than the traditional operation．

    C．More advanced technology should be encouraged to try on．

    D．Laser light treatment of heart disease still needs’more research．


    正确答案：D
    通读全文，特别是最后一段后半部分，可知正确答案应是D项。

  • 第3题：

    关于激光的英文"laser"，以下哪一项是正确的（）。

    • A、lightactivationbystimulationemanationofradiation
    • B、luminantamplimeterbystimulationemissionofradiation
    • C、lightactivationbystrongemissionofradiation
    • D、luminantactivationbeforestrongemissionofradiation
    • E、lightamplificationbystimulationemissionofradiation

    正确答案:E

  • 第4题：

    英译中：Laser scanner


    正确答案: 激光扫描仪

  • 第5题：

    Which of the following printers prints multi-part forms at once？ （）

    • A、ink jet
    • B、thermal
    • C、impact
    • D、laser

    正确答案:C

  • 第6题：

    Which of the following item colorizes the paper using a two-component laser printer？ （）

    • A、toner
    • B、laser beam
    • C、developer
    • D、ribbon

    正确答案:A

  • 第7题：

    单选题
    On a Windows 2000 Professional computer， you run a shipping application that prints packing labels to a laser printer for every outgoing shipment， 24 hours per day. During peak hours， your company ships more than 1，000 packages per hour. You have just purchased a second identical laser printer to aid in printing. You want to configure the printers so that the jobs are load balanced. You connect the second laser printer to the computer. What must you do next？ （）
    A

    Enable bi-directional support.

    B

    Enable printer pooling.

    C

    Configure print spooling.

    D

    Configure print sharing.


    正确答案： C
    解析： To load balance print jobs on two printers we must create a printer pool. The printer pool will then automatically distribute the print jobs to the first available print device and the print jobs will be load balanced.

  • 第8题：

    单选题
    What is an advantage of an externally modulated laser over a directly modulated laser?（）
    A

    lower cost

    B

    higher chirp

    C

    easier to manufacture

    D

    higher dispersion tolerance

    E

    higher optical signal-to-noise ratio


    正确答案： E
    解析： 暂无解析

  • 第9题：

    名词解释题
    英译中：Laser scanner

    正确答案： 激光扫描仪
    解析： 暂无解析

  • 第10题：

    单选题
    What is an advantage of an externally modulated laser over a directly modulated laser？ （）
    A

     lower cost

    B

     higher chirp

    C

     easier to manufacture

    D

     higher dispersion tolerance

    E

     higher optical signal-to-noise ratio


    正确答案： D
    解析： 暂无解析

  • 第11题：

    名词解释题
    聚焦扫描激光显微镜（confocal scanning laser microscope，CSLM）

    正确答案： 这种显微镜采用激光作为光源，每次仅对一个点进行照射，从而大大减少样品其他部分发出的杂散光的干扰。观察时通过激光器或载物台扫描，计算机处理，最终获得反差鲜明、高分辨率的三维立体数字图像。
    解析： 暂无解析

  • 第12题：

    单选题
    What is/are the advantage（s）of cranes over conventional cargo booms（）.
    A

    Cranes are able to pick up and drop loads over a greater spotting area

    B

    Increased safety because the deck is clear of running and standing rigging

    C

    Simplicity of operation of the crane by its operator

    D

    All of the above


    正确答案： B
    解析： 暂无解析

  • 第13题：

    Based on the laser operation treatment of three patients。what can we infer from the passage?

    A．Laser light treatment is safe and effective．

    B．Laser light treatment is dangerous and ineffective

    C．Laser light treatment still requires much more studies．

    D．Government should encourage doctors to do research of laser light treatment on the human body．


    正确答案：D
    通读文章第一段，根据第二段后半部分，特别是最后两句，可知正确的推断应是D项。

  • 第14题：

    What is an advantage of a gate valve over a butterfly valve ________．

    A.Less frequent maintenance

    B.Faster operation

    C.Cheaper

    D.More compact


    正确答案：A

  • 第15题：

    What is an advantage of an externally modulated laser over a directly modulated laser?（）

    • A、lower cost
    • B、higher chirp
    • C、easier to manufacture
    • D、higher dispersion tolerance
    • E、higher optical signal-to-noise ratio

    正确答案:D

  • 第16题：

    Which two statements are true about broadband cable （HFC） systems？（）

    • A、Cable modems only operate at Layer 1 of the OSI model.
    • B、Cable modems operate at Layers 1 and 2 of the OSI model.
    • C、Cable modems operate at Layers 1， 2， and 3 of the OSI model.
    • D、A function of the cable modem termination system （CMTS） is to convert the modulated signal from the cable modem into a digital signal.
    • E、A function of the cable modem termination system is to convert the digital data stream from the end user host into a modulated RF signal for transmission onto the cable system.

    正确答案:B,D

  • 第17题：

    A laser printer is sent for repair and the work order indicates that there is an image printing problem.  Which of the following should a technician do FIRST to confirm this problem？（）

    • A、Run the calibration feature on the laser printer.
    • B、Run a self-test image page from the printer.
    • C、Clean the corona wire and return printer.
    • D、Print a test page from a computer.

    正确答案:B

  • 第18题：

    You are the administrator of your company’s network. A user named Stephen in the graphics department logs on to his Windows 2000 Professional computer. He installs a shared color laser printer. The color laser printer is connected to a computer named Server1. The next day Stephen returns and logs on to a Windows NT Workstation 4.0 computer. Stephan reports that when he attempts to print a document to the shared color laser printer， the printer is not included in the list of available printers. You want to allow Stephen to send print jobs to the shared color laser printer from any computer on the network. What should you do？（）

    • A、Configure a roaming user profile for Stephen’s user account.
    • B、Configure the server properties of the printer system folder to connect to the shared printer.
    • C、Install the printer driver for the print device on the Windows NT workstation computer.
    • D、Upgrade the Windows NT Workstation computer to Windows 2000 Professional， and then import the profile settings for Stephen’s user account.

    正确答案:A

  • 第19题：

    单选题
    The water level of an exhaust gas boiler which is independent of the auxiliary boiler and just as the extra heating surface of it （）
    A

    will be modulated in proportion

    B

    will be modulated in proportion and integral

    C

    will be modulated in proportion and differential

    D

    will not be modulated at all


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    The best title of the text might be ______.
    A

    The Laser: A Scientific & Technological Wonder

    B

    The Laser: A Powerful Tool for Communications

    C

    The Laser: A Solution to Life-Saving Problems

    D

    The Laser: A Multimillion Dollar Invention


    正确答案： A
    解析：
    主旨题。从文章的整体意思来看，作者在这篇文章里面描述了激光作为科技发展的产物在通讯、医药等领域起到巨大作用。可以说激光是现代科技的一个奇迹。其他概括不够全面，或有失偏颇。故正确的答案为A。

  • 第21题：

    单选题
    Which of the following item colorizes the paper using a two-component laser printer？ （）
    A

    toner

    B

    laser beam

    C

    developer

    D

    ribbon


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    According to the text, the laser can ______.
    A

    standardize telephone cables

    B

    remove communications jams

    C

    improve the quality of human voices

    D

    increase the capacity of communications


    正确答案： C
    解析：
    细节题。通过关键句，原文第二段“telephone companies are now using laser light signals to transmit telephone calls through extremely small cables that are capable of carrying many more transmissions than the standard telephone cables．”可知，利用激光传递信号的声音比普通的电话电缆要多很多，这样通讯的传输能力就增强了。其他选项均不符合题意，故正确的答案为D。

  • 第23题：

    单选题
    What is NOT an advantage of containership operations over conventional break-bulk operations? （）.
    A

    Flexibility of operation

    B

    Greater operational safety

    C

    Lower stevedoring costs

    D

    Reduction of cargo damage


    正确答案： D
    解析： 暂无解析

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