● 一个局域网中某台主机的IP 地址为176.68.160.12，使用22 位作为网络地址，那么该局域网的子网掩码为_____(61)____，最多可以连接的主机数为____(62)_____。

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• 1● 静态图像压缩标准JPEG2000中使用的是_____(60)____算法。

  A.K-L变换

  B.离散正弦变换

  C.离散余弦变换

  D.离散小波变换

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• 2● 双层双面的只读DVD盘片的存储容量可以达到_____(59)____。

  A.4.7GB

  B.8.5GB

  C.17GB

  D.6.6GB

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• 3● 电视系统采用的颜色空间中，其亮度信号和色度信号是相分离的。下列颜色空间中,__(58)___不属于电视系统的颜色空间。

  A.YUV

  B.YIQ

  C.YcbCr

  D.HSL

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• 4● PC 机处理人耳能听得到的音频信号，其频率范围是__(57)___。

  A.80～3400Hz

  B.300～3400Hz

  C.20～20kHz

  D.20～44.1kHz

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• 5● GB/T16260－2003将软件质量特性分为内部质量特性、外部质量特性和_____(56)____。

  A.安全质量特性

  B.适用质量特性

  C.性能特性

  D.使用质量特性

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• 6● 以下选项中，可以用于Internet信息服务器远程管理的是____(63)____。

  A.Telnet

  B.RAS

  C.FTP

  D.SMTP

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• 7● 在TCP/IP 网络中，为各种公共服务保留的端口号范围是__(64)____。

  A.1～255

  B.1～1023

  C.1～1024

  D.1～65535

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• 8● 在以下网络应用中，要求带宽最高的应用是___(65)___。

  A.可视电话

  B.数字电视

  C.拨号上网

  D.收发邮件

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• 9● DOM is a platform-and language-____(66)___API that allows programs and scripts　to dynamically access and update the content, structure and style of WWW documents　(　currently, definitions for HTML and XML documents are part of the specification　).The　document can be further processed and the results of that processing can be　incorporated back into the presented ___(67)____.DOM is a ___(68)___-based API to　documents ,which requires the whole document to be represented in ____(69)___while　processing it .A simpler alternative to DOM is the event –based SAX, which can be　used to process very large ___(70)___documents that do not fit into the memory　available for processing.

  A.specific

  B.neutral

  C.contained

  D.related

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• 10● Melissa and Love Letter made use of the trust that exists between friends or colleagues.　Imagine receiving an __(71)___from a friend who asks you to open it.　This is what happens with Melissa and several other similar email __(72)___.Upon　running ,such worms usually proceed to send themselves out to email addresses from the victim's address book, previous emails, web pages__(73)___.As administrators seek to block dangerous email attachments through the recognition of well-known ___(74)____,virus writers use other extensions to circumvent such protection.　Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.Frequently ,hackers try to penetrate networks by sending an attachment that looks like a flash movie ,which, while displaying some cute animation ,simultaneously runs commands in the background to steal your passwords and give the __(75)__access to your network.

  A.attachment

  B.packet

  C.datagram

  D.message

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