(51)A.运算器 B.控制器 C.存储器 D.I/O接口
●控制机器指令执行的微程序存放在__(52)__中。
(52)A.控制存储器 B.指令寄存器 C.内部存储器 D.SRAM
●构成4M×8bit的存储器,若采用256K×8bit的芯片,需__(53)__片:若采用512K×lbit的芯片,需__(54)__片。
(53)A.8 B.16 C.32 D.64
(54)A.8 B.16 C.32 D.64
●在进行原码乘法时,乘积的符号位是由被乘数的符号位和乘数的符号位通过__(55)__运算来获得的。
(55)A.或 B.与 C.异或 D.分别取反后再进行或
●在CPU执行一段程序的过程中,Cache的存取次数为3800次,由主存完成的存取次数为200次。若Cache的存取厨期为5ns,主存的存取周期为25ns,则Cache的命中率为__(56)__CPU的平均访问时间为__(57)__ ns。
(56)A.0.93 B.0.95 C.0.97 D.0.99
(57)A.5 B.6 C.7 D.8
●磁盘存取时间包括寻道的时间、定位扇区的时向以及读写数据的时间,若磁盘的转速提高一倍,则__(58)__。
(58)A.平均存取时间减少 B.平均寻道时间减少
C.存储道密度增加一倍 D.平均寻道时间增加
●以串行同步方式传送数据块时,经常采用的差错校验方法是__(59)__。
(59)A.偶校验 B.奇校验 C.海明码校验 D.CRC校验
●在主存和CPU之间增加Cache的自的是__(60)__。
(60)A.增加内存容量 B.为程序员编程提供方便
C.解决CPU与内存间的速度匹配问题 D.提高内存工作的可靠性
●ADSL对应的中文术语是__(61)__,它的两种Intenet接入方式是__(62)__接入。
(61)A.分析数字系统层 B.非对称数字线
C.非对称数字用户线 D.异步数字系统层
(62)A.固定接入和虚拟拨号 B.专线接入和VLAN
C.固定接入和VLAN D.专线接入和虚拟拨号
●TCP/IP是一个协议簇,它的体系结构分为四层:应用层、网际层、网络接口层和__(63)__,其中ARP协议属于__(64)__。为了在源主机和目的主机之间传送数据,IP协议需要确定源主机和目的主机是否在同一个网络中。如果不在同一网络时,则必须通过__(65__进行通信。
(63)A.会话层 B.传输层 C.网络层 D.表示层
(64)A.应用层 B.传输层 C.网际层 D.网络接口层
(65)A.网关或路由器 B.中继器 C.集线器 D.终端匹配器
●One use of networks is to let several computers share __(66)__ such as file systems,
printers, and tape drives.
(66) A.CPU B.memory C.resources D.data
●A firewall is a __(67)__ system designed to __(68)__ an organization’s network against threats.
(67) A.operating B.programming C.security D.service
(68) A.prevent B.protect C.develop D.exploit
●The __(69)__ has several major components, including the system kernel, a memory management system, the file system manager, device drivers, and the system libraries.
(69) A.application B.information system
C.network D.operating system
●__(70)__ is the address of a variable or a variable in which the address of another variable is stored.
(70) A.Director B.Pointer C.Array D.Record
●C++ is used with proper __(71)__ design techniques.
(71) A.object-oriented B.object-based
C.face to object D.face to target
●__(72)__ is a contiguous, numbered set of variables of a given base type, which can be used and passed to functions as a unit.
(72) A.Record B.Array C.File D. Parameter
●(73) is not a programming language.
(73) A.COBOL B.Java C.UML D.Basic
●__(74)__ is nonprogram text embedded in a program to explain its form and function to
human readers.
(74) A.Command B.Compile C.Comment D.Statement
●When the result of an operation becomes larger than the limits of the representation,__(75)__ occurs.
(75) A.overdose B.overflow C.overdraft D.overexposure
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