The data station usually means a(71)unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary

题目

The data station usually means a(71)unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72)control functions.In(73)data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74)by the primary station, interprets received commands and (75) responses to be transmitted.

A.performance

B.functional

C.capacity

D.quality


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  • 第1题:

    In(71)programming,the user determines the sequence of instructions to be executed,not the programmer.

    A.top-down

    B.structure

    C.data-driven

    D.event-driven


    正确答案:D
    解析:在事件驱动的程序中,由用户而不是程序员决定将被执行的指令的序列。

  • 第2题:

    Project(71)is an uncertain event or condition that,if it occurs,has a positive or a negative effect on at least one project objective,such as time,cost,scope,or quality.

    A.risk

    B.problem

    C.result

    D.data


    正确答案:A
    风险是一个不确定因素或条件,如果它一旦发生,可能对至少一个项目目标,如项目进度、项目成本、项目范围或项目质量产生负面或正面的影响。选项A是风险,选项B是问题,选项C是结果,选项D是数据。根据项目风险定义,风险包括两方面含义:一是未实现目标;二是不确定性。因此应选择A。

  • 第3题:

    在有13个元素构成的有序表data[1..13]中,用折半查找(即二分查找,计算时向下取整)方式查找值等于data[8]的元素时,先后与(41)等元素进行了比较。

    A.data[7]. data[6]. data[8]

    B.data[7]. Data[8]

    C.data[7]. data[10]. data[8]

    D.data[7]. data[10]、data[9]. data[8]


    正确答案:C
    本题考查数据结构基础知识。在二分查找(即折半查找)过程中,令处于中间位置记录的关键字和给定值比较,若相等,则查找成功:若不等,则缩小范围,直至新的查找区间中间位置记录的关键字等于给定值或者查找区间没有元素时(表明查找不成功)为止。在有13个元素构成的有序表data[1..13]中进行二分查找的过程如下图所示(计算中间元素位置时向下取整,结点中的数字为元素的下标或序号),从中可以看出,查找元素data[8]时,需与data[7]、data[10]、data[8]等元素比较。

  • 第4题:

    A firewall is a(71)system designed to(72)an organization's network against threats.

    A.operating

    B.programming

    C.security

    D.data


    正确答案:C
    解析:译文:防火墙是一个安全系统,它被设计用来保护某组织的网络不受破坏。

  • 第5题:

    One use of networks is to let several computers share(71)such as file systems, printers, and tape drives.

    A.CPU

    B.memory

    C.resources

    D.data


    正确答案:C
    解析:网络的一个用处就是能让几台计算机共享资源,例如文件系统、打印机和磁带机等。

  • 第6题:

    在有13个元素构成的有序表data[1..13]中,用折半查找(即二分查找,计算时向下取整)方式查找值等于data[8]的元素时,先后与( )等元素进行了比较。

    A.data[7]、data[6]、data[8]
    B.data[7]、data[8]
    C.data[7]、data[10]、data[8]
    D.data[7]、data[10]、data[9]、data[8]

    答案:C
    解析:
    本题考查数据结构基础知识。
    在二分查找(即折半查找)过程中,令处于中间位置记录的关键字和给定值比较,若相等,则查找成功;若不等,则缩小范围,直至新的查找区间中间位置记录的关键字等于给定值或者查找区间没有元素时(表明查找不成功)为止。
    在有13个元素构成的有序表data[1..13]中进行二分查找的过程如下图所示(计算中间元素位置时向下取整,结点中的数字为元素的下标或序号),从中可以看出,查找元素data[8]时,需与data[7]、data[10]、data[8]等元素比较。