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The writer sees education as______.A. a means of providing job security and financial security and a means of meeting a country's demands for technical workersB. a way to broaden one's horizonsC. more important than finding a jobD. an opportunity that eve

题目

The writer sees education as______.

A. a means of providing job security and financial security and a means of meeting a country's demands for technical workers

B. a way to broaden one's horizons

C. more important than finding a job

D. an opportunity that everyone should have


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  • 第1题:

    某单道批处理系统中有四个作 JOBl、JOB2、JOB3、JOB4,它们到达“输入井”的时刻和所需要的运行时间如下表所示。

    作业 进入系统时间 估计运行时间(分钟)

    JOB1 8:30 80

    JOB2 8:50 20

    JOB3 9:20 40

    JOB4 9:30 35

    假设9:30开始作业调度,按照最高响应比作业优先算法,首先被调度的作业是______。

    A.JOB1

    B.JOB2

    C.JOB3

    D.JOB4


    正确答案:B

  • 第2题:

    设有一组作业,它们的作业提交时刻及估计运行时间如下所示: 作业号 提交时刻 估计运行时间(分钟) Job1 8:30 70 Job2 9:10 30 Job3 9:30 15 Job4 9:50 5 在单道批处理方式下,采用短作业优先调度算法,作业的执行顺序为

    A.Job1,Job4,Job3,Job2

    B.Job1,Job3,Job4,Job2

    C.Job4,Job3,Job2,Job1

    D.Job4,Job1,Job2,Job3


    正确答案:B
    解析:本题考查短作业优先调度算法的概念。短作业(进程)优先调度算法是指对短作业或短进程优先调度的算法。它们可以分别用于作业调度和进程调度。短作业优先调度算法,是从后备队列中选择一个或若干个估计运行时间最短的作业,将它们调入内存运行。而短进程优先调度算法,则是从就绪队列中选出一估计运行时间最短的进程,将处理机分配给它,使它立即执行并一直执行到完成,或发生某事件而被阻塞放弃处理机时,再重新调度。进程首先执行的是Job1,该作业到9:40完成,此时Job2和Job3在等待队列中,按照短作业调度算法,此时执行Job3。Job3在10:10,此时等待队列中有Job2和Job4作业,此时执行Job4,最后执行Job2。正确答案为选项B。

  • 第3题:

    YouuseaWindows2000Professionalcomputertorunaweeklyaccountstable.Thereporthasthenameap_financial_reports.Youalsowanttheusethecomputertorunatasknamedperf_logtoconnecttonetworkroutersandretrievetheirperformancelogs.Whentheap_financial_reportisrunningonthecomputerperf_logtaskstopsrespondingtheeventuallytimesout.Whenyourunonlytheperf_logtaskthetaskcompletessuccessfully.Youusethetaskmanagertoviewyoursystemresources.Youwanttoresolvetheperformancelogtimeoutproblembyusingtaskmanager.Whatshouldyoudo?()


    参考答案:A

  • 第4题:

    某单道批处理系统中有四个作业JOB1、JOB2、JOB3和JOB4,它们到达“输入井”的时刻和需要的运行时间如下表

    假设9:30开始进行作业调度,按照最高响应比作业优先算法,首先被调度的作业是

    A.JOB1

    B.JOB2

    C.JOB3

    D.JOB4


    正确答案:B
    解析:响应比定义为系统对作业的响应时间与作业运行时间的比值。最高响应比作业优先算法优先选择响应比最高的作业。对JOB1、JOB2、JOB3和JOD4的响应比分别为60/80:0.75、40/20=2、10/40=0.25和0/35=0,因此首先被调度的作业是JOB2。

  • 第5题:

    ASystempadministratorneedstosetthedefaultpasswordlengthforalluserstosixcharacters.Whichofthefollowingfilesneedstobeeditedtoaccomplishthis()

    A./etc/security/limits

    B./etc/security/mkuser.sys

    C./etc/security/priv

    D./etc/security/user


    参考答案:D

  • 第6题:


    According to Para.7,which of the following is not the way that passage suggests to improve cyber-security?( )

    A.Be quick to predict and respond when there is insecurity.
    B.Make sure everyone is equipped with fundamental knowledge of cyber-security.
    C.Be cooperative with counterparts on cyber-security.
    D.Be cautious using Internet.

    答案:D
    解析: