The most widely used LAN system is ______ which adopts a form. of access known as CSMA-CD．A．EthemetB．ATMC．FDDID．Wireless

题目

The most widely used LAN system is ______ which adopts a form. of access known as CSMA-CD．

A．Ethemet

B．ATM

C．FDDI

D．Wireless

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1.Melissa and LoveLetter 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 nm 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．attachmentB．packetC．datagramD．message

2.有下列SQLSELECT语句：SELECT*FORM. 成绩表 WHERE 物理 BETWEEN 80 AND 90下列与该语句等价的是( )。A．SELECT*FORM. 成绩表 WHERE物理＜=90AND 物理＞=80B．SELECT*FORM. 成绩表 WHERE物理＜90AND 物理＞80C．SELECT*FORM. 成绩表 WHERE物理＞=90AND 物理＜=80D．SELECT*FORM. 成绩表 WHERE物理＞90 AND 物理＜80

3.[A] for[B] into[C] form.[D] against

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更多“The most widely used LAN system is ______ which adopts a form. of access known as CSMA－CD. ”相关问题

  • 第1题：

    有如下SQL SELECT语句SELECT*FORM. 工资表 WHERE 基本工资<=2000 AND 基本工资>=1500下列与该语

    有如下SQL SELECT语句 SELECT*FORM. 工资表 WHERE 基本工资＜＝2000 AND 基本工资＞＝1500 下列与该语句等价的

    A．SELECT*FORM. 工资表 WHERE 基本工资 BETWEEN 1500 AND 2000

    B．SELECT*FORM. 工资表 WHERE 基本工资 BETWEEN 2000 AND 1500

    C．SELECT*FORM. 工资表 WHERE 基本工资 FROM1500 INTO 2000

    D．SELECT*FORM. 工资表 WHERE 基本工资 FROM 2000 INTO 1500


    正确答案：A
    解析：SQL查询语句中特殊运算BE- TWEEN．．．AND．．，的含义为“…和…之间”。BETWEEN…AND．．．是SQL查询语句中的一个特殊运算符，意思为“…和…之间”，相当与逻辑运算中的(A＞＝AND＞＝8，其中A＞B)，选项 B)中数值放置错误，选项

  • 第2题：

    有下列SQL SELECT语句： SELECT * FORM. 成绩表 WHERE 物理 BETWEEN 80 AND 90 下列与该语句等价的( )。

    A．SELECT * FORM. 成绩表 WHERE 物理＜=90 AND 物理 ＞=80

    B．SELECT * FORM. 成绩表 WHERE 物理 ＜90 AND 物理＞80

    C．SELECT * FORM. 成绩表 WHERE 物理＞=90 AND 物理＜=80

    D．SELECT * FORM. 成绩表 WHERE 物理＞90 AND 物理＜80


    正确答案：A
    解析：BETWEEN..AND...是SQL查询语句中的一个特殊运算符，意思为“...和...之间”，相当与逻辑与运算中的(A＞=AND＞=B，其中A＞B)。

  • 第3题：

    Melissa and Love Letter made use of the trust that exists between friends or colleagues. Imagine receiving an(66)from a friend who asks you to open it. This is what happens with Melissa and several other similar email(67).Upon running, such worms usually proceed to send themselves out to email addresses from the victim' s address book ,previous emails, web pages(68).

    As administrators seek to block dangerous email attachments through the recognition of well- known (69), virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to . bat and . cnd 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(70)access to your network.

    A．attachment

    B．paeket

    C．datagram

    D．message


    正确答案：A
    解析：梅丽莎病毒和爱虫病毒都是利用同事或朋友之间的信任。假设收到一封来自朋友的附件，并让你打开看看，这就是梅丽莎以及其他类似的邮件病毒惯用的方式。不断地前进，这些“蠕虫”会将自己寄给那些从牺牲者的邮件薄里或上一封邮件或网页登陆得来的邮箱地址。当管理员致力于阻止危险邮件通过知名软件的识别时，那些病毒制造者又在利用其他途径来回避这种保护，可执行文件被重新命名为批处理文件或dos文件加上一系列扩展名，将仍旧成功地感染终端使用者，黑客们经常会努力发一些看起来像动画电影的附件来进入网络，这些附件可以一边展现极具吸引力的动画制作技术，一边暗地里执行一些命令来获取你的密码，并安装一个炸弹进入你的网络。

  • 第4题：

    阅读下列代码 public class Test2005{ public static void main(String args[]){ String s="Test"； switch(s){ case"Java"：System．out．print("Java")； break； case"Language"：System．out．print("Lan- guage")； break； case"Test"：System．out．print("Test")； break； } } } 其运行结果是（ ）。

    A.Java

    B.Language

    C.Test

    D.编译时出错


    正确答案：D
    D。【解析】本题考查switch语句的用法。switch语句是多分支语句，即根据表达式的值来执行多个操作中的一个。在switch语句中，”表达式”的返回值类型必须是这几种类型之一：int、byte、char、short。本题中，switch的表达式s是一个字符串Strin9类型的值，它不是int、byte、char、short中的任意一个。因此表达式s的类型不对，编译时出错。

  • 第5题：

    CompanycomwantstoapplyaPTFtothep5590system.Afterdoingapreviewinstall,theoutputshowsthereisinsufficientspaceinthe/usrfilesystem.Therootvolumegrouphasnoavailablephysicalpartitionsleft.Theydonotwanttoaddadditionaldiskdrivestothesystem,buthaveajfs2filesystemthatisonly8%used.Whatcouldtheydotoutilizespaceinthejfs2filesystemtoapplythisPTF?（）

    A.Backupthefilesystemandrecreatesmaller

    B.Usethechfstoreducethefilesystemsize

    C.Usecplvtocopyfilesystemtosmallersize

    D.Usemigratepvtocopyfilesystemtosmallersize


    参考答案：B

  • 第6题：

    The shutters stood( )，and through one of the newly-washed windows I caught the light of a fire.

    A.wide
    B.straight
    C.upright
    D.widely

    答案：A
    解析：
    考查副词辨析。百叶窗全开着，透过刚擦完的玻璃，我看到了一束火光。

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