单选题某项目组拟开发一个大规模系统，且具备了相关领域及类似规模系统的开发经验。下列过程模型中，______最适合开发此项目。 A．原型模型 B．瀑布模型 C．V模型 D．螺旋模型
单选题若将某有序树T转换为二叉树T1，则T中节点的后(根)序序列就是T1中节点的______遍历序列。例如，图(a)所示的有序树转化为二叉树后如图(b)所示。
单选题风险分析在软件项目开发中具有重要作用，包括风险识别、风险预测、风险评估和风险控制等。“建立风险条目检查表”是 (6) 时的活动，“描述风险的结果”是 (7) 时的活动。
单选题 (29) 是一种很强的“拥有”关系，“部分”和“整体”的生命周期通常一样。整体对象完全支配其组成部分，包括它们的创建和销毁等； (30) 同样表示“拥有”关系，但有时候“部分”对象可以在不同的“整体”对象之间共享，并且“部分”对象的生命周期也可以与“整体”对象不同，甚至“部分”对象可以脱离“整体”对象而单独存在。上述两种关系都是 (31) 关系的特殊种类。
单选题在屏蔽软件错误的容错系统中，冗余附加技术的构成不包括______。
单选题Why is (111) fun? What delights may its practitiopect as his reward? First is the sheer joy of making things. As the child delights in his mud pie, so the adult enjoys building things, especially things of his own design. Second is the pleasure of making things that are useful to other people. Third is the fascination of fashioning complex puzzle-like objects of interlocking moving parts and watching them work in subtle cycles, playing out the consequences of principles built in from the beginning. Fourth is the joy of always learning, which springs from the (112) nature of the task. In one way or another the problem is ever new, and its solver learns something: sometimes (113) , sometimes theoretical, and sometimes both. Finally, there is the delight of working in such a tractable medium. The (114) , like the poet, works only slightly removed from pure thought-stuff. Few media of creation are so flexible, so easy to polish and rework, so readily capable of realizing grand conceptual structures. Yet the program (115) , unlike the poet's words, is real in the sense that it moves and works, producing visible outputs separate from the construct itself. It prints results, draws pictures, produces sounds, moves arms. Programming then is fun because it gratifies creative longings built deep within us and delights sensibilities we have in common with all men.
单选题设有职工EMP(职工号，姓名，性别，部门号，职务，进单位时间，电话)，职务JOB(职务，月薪)和部门DEPT(部门号，部门名称，部门电话，负责人)实体集。一个职务可以由多个职工担任，但一个职工只能担任一个职务，并属于一个部门，部门负责人是一个职工。下图所示的a、b处的实体名分别为(11)；图中a、b之间为(12)联系。
单选题因争用资源产生死锁的必要条件是互斥、循环等待、不可抢占和 (16) 。对于缓冲池 (大量缓冲区)的管理，采用生产者-消费者方式解决同步或互斥时，通常需要用 (17) 个信号量。
单选题风险分析在软件项目开发中具有重要作用，包括风险识别、风险预测、风险评估和风险控制等。“建立风险条目检查表”是 (43) 时的活动，“描述风险的结果”是 (44) 时的活动。
单选题设集合N=0，1，2，…，f为从N到N的函数，且经计算f(90)=81，f(89)=81，f(49)=______。A．39B．49C．81D．92
单选题某计算机字长为16位，运算器为16位，有16个16位通用寄存器，8种寻址方式，主存容量为64K字。指令中地址码由寻址方式字段和寄存器字段组成，采用单字长指令，则该计算机最多可构成 (1) 条单操作数指令；寄存器间接寻址的范围为 (2) K字。
单选题阵列处理机属于______计算机。 A．SISD B．SIMD C．MISD D．MIMD
单选题设节点x和y是二叉树中任意的两个节点，在该二叉树的先根遍历序列中x在y之前，而在其后根遍历序列中x在y之后，则x和y的关系是 (17) 。
单选题软硬件故障常造成数据库中的数据破坏。数据库恢复就是______。
单选题与等价的逻辑表达式是______。(表示逻辑异或，+表示逻辑加)
单选题软件著作权的客体不包括______。
单选题以下关于面向对象方法中继承的叙述中，错误的是______。 A．继承是父类和子类之间共享数据和方法的机制 B．继承定义了一种类与类之间的关系 C．继承关系中的子类将拥有父类的全部属性和方法 D．继承仅仅允许单重继承，即不允许一个子类有多个父类
单选题在活动图中，结点表示项目中各个工作阶段的里程碑，连接各个结点的边表示活动，边上的数字表示活动持续的时间。在下面的活动图1-1中，从A到J的关键路径是(15)，关键路径长度是(16)，从E开始的活动启动的最早时间是(17)。
单选题Generally, data mining (sometimes called data or knowledge discovery) is the process of analyzing data from different perspectives and (1) it into useful information information that can be used to increase revenue, (2) costs, or both. Data mining software is one of a number of analytical tools for analyzing data. It (3) users to analyze data from many different dimensions or angles, categorize it, and summarize the relationships identified. Technically, data mining is the process of finding correlations or patterns among dozens of fields in large relational databases. Although data mining is a (4) new term, the technology is not. Companies have used powerful computers to sift through volumes of supermarket scanner data and analyze market research reports for years. However, continuous innovations in computer processing power, disk storage, and statistical software are dramatically increasing the accuracy of analysis while driving (5) the cost.
单选题______将一个类的接口转换成客户希望的另外一个接口，使得原本由于接口不兼容而不能一起工作的那些类可以一起工作。