你可能感兴趣的试题

某计算机系统由下图所示的部件构成，假定每个部件的千小时可靠度R均为0.9，则该系统的千小时可靠度约为（）。

某计算机指令字长为16位，指令有双操作数、单操作数和无操作数3种格式，每个操作数字段均用6位二进制表示，该指令系统共有m条（m<16）双操作数指令，并存在无操作数指令。若采用扩展操作码技术，那么最多还可设计出（）条单操作数指令。

软件项目开发成本的估算依据，通常是开发成本估算模型。常用的模型主要有：
①IBM模型
②PUtnam模型
③基本COCOMO模型
④中级COCOMO模型
⑤高级COCOMO模型
其中（）均是静态单变量模型。

从下表关于操作系统存储管理方案1、方案2和方案3的相关描述可以看出，它们分别对应（）存储管理方案。

给定C语言程序：

当用路径覆盖法进行测试时，至少需要设计（）个测试用例。

下图描述了一种设计模式，该设计模式不可以（）。

关系R、S如下图所示，元组演算表达式的结果为（）。

某双向链表中的结点如下图所示，删除t 所指结点的操作为（）。

某计算机的时钟频率为 400MHz，测试该计算机的程序使用 4 种类型的指令。每种指令的数量及所需指令时钟数(CPI)如下表所示，则该计算机的指令平均时钟数为 (4) ;该计算机的运算速度约为 (5) MIPS。

“冲击波”病毒属于 (8) 类型的病毒，它利用Windows 操作系统的 (9) 漏洞进行快速传播。

某计算机的时钟频率为 400MHz，测试该计算机的程序使用 4 种类型的指令。每种指令的数量及所需指令时钟数(CPI)如下表所示，则该计算机的指令平均时钟数为 (4) ;该计算机的运算速度约为 (5) MIPS。

“冲击波”病毒属于 (8) 类型的病毒，它利用Windows 操作系统的 (9) 漏洞进行快速传播。

常见的软件开发模型有瀑布模型、 演化模型、 螺旋模型、 喷泉模型等。其中 (15)模型适用于需求明确或很少变更的项目， (16) 模型主要用来描述面向对象的软件开发过程。

某幅图像具有640×480 个像素点，若每个像素具有8 位的颜色深度，则可表示(13) 种不同的颜色，经5:1 压缩后，其图像数据需占用(14) (Byte)的存储空间。

某幅图像具有640×480 个像素点，若每个像素具有8 位的颜色深度，则可表示(13) 种不同的颜色，经5:1 压缩后，其图像数据需占用(14) (Byte)的存储空间。

常见的软件开发模型有瀑布模型、 演化模型、 螺旋模型、 喷泉模型等。其中 (15)模型适用于需求明确或很少变更的项目， (16) 模型主要用来描述面向对象的软件开发过程。

在一个单CPU 的计算机系统中，采用可剥夺式（也称抢占式）优先级的进程调度方案，且所有任务可以并行使用I/O 设备。下表列出了三个任务刊、T2, T3 的优先级、独立运行时占用CPU 和I/O 设备的时间。如果操作系统的开销忽略不计，这三个任务从同时启动到全部结束的总时间为__（21）__ms．CPU 的空闲时间共有__（22）__ms。

UML 的设计视图包含了类、接口和协作，其中，设计视图的静态方面由（37）和（38）表现；动态方面由交互图、（39）表现。

假设系统中有三类互斥资源R1, R2 和R3,可用资源数分别为8, 7 和4。在T0 时刻系统中有P1、P2, P3, P4 和P5 五个进程，这些进程对资源的最大需求量和己分配资源数如下表所示。在T0 时刻系统剩余的可用资源数分别为（24）。如果进程按（25）序列执行，那么系统状态是安全的。

ARP 协议的作用是（61），ARP 报文封装在（62）中传送。

下图是一有限自动机的状态转换图，该自动机所识别语言的特点是（45），等价的正规式为（46）。

操作序列T1、T2、T3 对数据A、B、C 并发操作如下所示，T1 与T2 间并发操作（50）,T2与T3 间并发操作（51）。

某企业职工和部门的关系模式如下所示，其中部门负责人也是一个职工。职工和部门关系的外键分别是（48）。 职工（职工号，姓名，年龄，月工资，部门号，电话，办公室） 部门（部门号，部门名，负责人代码，任职时间） 查询每个部门中月工资最高的“职工号”的SQL 查询语句如下： Select 职工号from 职工as E where 月工资=(Select Max(月工资) from 职工as M（49）)。

对于具有n 个元素的一个数据序列，若只需得到其中第k 个元素之前的部分排序，最好采用（59），使用分治(Divide and Conquer)策略的是（60）算法。

结点数目为n 的二叉查找树（二叉排序树）的最小高度为（52）、最大高度为（53）。

（52）处填（）。

ARP 协议的作用是（61），ARP 报文封装在（62）中传送。

在一个单CPU 的计算机系统中，采用可剥夺式（也称抢占式）优先级的进程调度方案，且所有任务可以并行使用I/O 设备。下表列出了三个任务刊、T2, T3 的优先级、独立运行时占用CPU 和I/O 设备的时间。如果操作系统的开销忽略不计，这三个任务从同时启动到全部结束的总时间为__（21）__ms．CPU 的空闲时间共有__（22）__ms。

操作序列T1、T2、T3 对数据A、B、C 并发操作如下所示，T1 与T2 间并发操作（50）,T2与T3 间并发操作（51）。

UML 的设计视图包含了类、接口和协作，其中，设计视图的静态方面由（37）和（38）表现；动态方面由交互图、（39）表现。

下图是一有限自动机的状态转换图，该自动机所识别语言的特点是（45），等价的正规式为（46）。

对于具有n 个元素的一个数据序列，若只需得到其中第k 个元素之前的部分排序，最好采用（59），使用分治(Divide and Conquer)策略的是（60）算法。

假设系统中有三类互斥资源R1, R2 和R3,可用资源数分别为8, 7 和4。在T0 时刻系统中有P1、P2, P3, P4 和P5 五个进程，这些进程对资源的最大需求量和己分配资源数如下表所示。在T0 时刻系统剩余的可用资源数分别为（24）。如果进程按（25）序列执行，那么系统状态是安全的。

某企业职工和部门的关系模式如下所示，其中部门负责人也是一个职工。职工和部门关系的外键分别是（48）。 职工（职工号，姓名，年龄，月工资，部门号，电话，办公室） 部门（部门号，部门名，负责人代码，任职时间） 查询每个部门中月工资最高的“职工号”的SQL 查询语句如下： Select 职工号from 职工as E where 月工资=(Select Max(月工资) from 职工as M（49）)。

结点数目为n 的二叉查找树（二叉排序树）的最小高度为（52）、最大高度为（53）。

（53）处填（）。

UML 的设计视图包含了类、接口和协作，其中，设计视图的静态方面由（37）和（38）表现；动态方面由交互图、（39）表现。

Virtualization is an approach to IT that pools and shares__（71）__so that utilization is optimized and supplies automatically meet demand．Traditional IT environments are often silos, where both technology and human __（72）__。 are aligned around an application or business function．With a virtualized __（73）__，people, processes, and technology are focused on meeting service levels, __（74）__ is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible．We offer a broad spectrum of virtualization__（75）__that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources．

NAC’s（Network Access Control）role is to restrict network access to only compliant endpoints and __（66）__ users．However, NAC is not a complete LAN__（67）__solution; additional proactive and__（68）__security measures must be implemented．Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 100Gbps, ensuring a high level of security plus application availability and performance．Nevis integrates NAC as the first line of LAN security __（69）__In addition to NAC，enterprises need to implement role-based network access control as well as critical proactive security measures-real-time, multilevel __（70）__inspection and microsecond threat containment．

Virtualization is an approach to IT that pools and shares__（71）__so that utilization is optimized and supplies automatically meet demand．Traditional IT environments are often silos, where both technology and human __（72）__。 are aligned around an application or business function．With a virtualized __（73）__，people, processes, and technology are focused on meeting service levels, __（74）__ is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible．We offer a broad spectrum of virtualization__（75）__that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources．

Virtualization is an approach to IT that pools and shares__（71）__so that utilization is optimized and supplies automatically meet demand．Traditional IT environments are often silos, where both technology and human __（72）__。 are aligned around an application or business function．With a virtualized __（73）__，people, processes, and technology are focused on meeting service levels, __（74）__ is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible．We offer a broad spectrum of virtualization__（75）__that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources．

NAC’s（Network Access Control）role is to restrict network access to only compliant endpoints and __（66）__ users．However, NAC is not a complete LAN__（67）__solution; additional proactive and__（68）__security measures must be implemented．Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 100Gbps, ensuring a high level of security plus application availability and performance．Nevis integrates NAC as the first line of LAN security __（69）__In addition to NAC，enterprises need to implement role-based network access control as well as critical proactive security measures-real-time, multilevel __（70）__inspection and microsecond threat containment．

NAC’s（Network Access Control）role is to restrict network access to only compliant endpoints and __（66）__ users．However, NAC is not a complete LAN__（67）__solution; additional proactive and__（68）__security measures must be implemented．Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 100Gbps, ensuring a high level of security plus application availability and performance．Nevis integrates NAC as the first line of LAN security __（69）__In addition to NAC，enterprises need to implement role-based network access control as well as critical proactive security measures-real-time, multilevel __（70）__inspection and microsecond threat containment．

Virtualization is an approach to IT that pools and shares__（71）__so that utilization is optimized and supplies automatically meet demand．Traditional IT environments are often silos, where both technology and human __（72）__。 are aligned around an application or business function．With a virtualized __（73）__，people, processes, and technology are focused on meeting service levels, __（74）__ is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible．We offer a broad spectrum of virtualization__（75）__that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources．

NAC’s（Network Access Control）role is to restrict network access to only compliant endpoints and __（66）__ users．However, NAC is not a complete LAN__（67）__solution; additional proactive and__（68）__security measures must be implemented．Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 100Gbps, ensuring a high level of security plus application availability and performance．Nevis integrates NAC as the first line of LAN security __（69）__In addition to NAC，enterprises need to implement role-based network access control as well as critical proactive security measures-real-time, multilevel __（70）__inspection and microsecond threat containment．

Virtualization is an approach to IT that pools and shares__（71）__so that utilization is optimized and supplies automatically meet demand．Traditional IT environments are often silos, where both technology and human __（72）__。 are aligned around an application or business function．With a virtualized __（73）__，people, processes, and technology are focused on meeting service levels, __（74）__ is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible．We offer a broad spectrum of virtualization__（75）__that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources．

NAC’s（Network Access Control）role is to restrict network access to only compliant endpoints and __（66）__ users．However, NAC is not a complete LAN__（67）__solution; additional proactive and__（68）__security measures must be implemented．Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 100Gbps, ensuring a high level of security plus application availability and performance．Nevis integrates NAC as the first line of LAN security __（69）__In addition to NAC，enterprises need to implement role-based network access control as well as critical proactive security measures-real-time, multilevel __（70）__inspection and microsecond threat containment．