单选题以下关于信息库(repository)的叙述中，最恰当的是 (3) ； (4) 不是信息库所包含的内容。

单选题关系模式Student(Sno，Sname，Cno，Cname，Grade，Tname，Taddr)的属性分别表示学号、学生姓名、课程号、课程名、成绩、任课教师名和教师地址。其中，一个学生可以选若干门课程，一个教师可以讲授若干门课程，一门课程可以由多个教师讲授，对于同一门课程，学生只能选定一个教师讲授的课程，教师不会重名。关系模式Student的分解ρ=______，并且是无损联接及保持函数依赖。

单选题进程P1、P2、P3、P4、P5的前趋关系图如图1所示：图1前趋关系图若用PV操作控制这5个进程的同步与互斥，程序如下：beginS1,S2,S3,S4,S5,S6:semaphore;//定义信号量S1:=0;S2:=0;S3:=0;S4:=0;S5:=0;S6:=0;CobeginprocessP1processP2processP3processP4processP5beginbeginbeginbeginbeginP1执行；{{U}}a.{{/U}};{{U}}c.{{/U}};{{U}}(e){{/U}};P(S5);V(S1);P2执行;P3执行;P4执行;P(S6);{{U}}b.{{/U}};{{U}}d.{{/U}};{{U}}(f){{/U}};P5执行;end;end;end;end;end;Coend;end.程序中空a和空b处应分别为______，空c和空d处应分别为______；空e和空f处应分别为______。

单选题信息工程强调以“数据”为战略资源，以“数据规划”为基础，并以______的组织和实施来实现，并提供直到系统完成的各阶段的实施方法。

单选题SOX is an alternative (156) for XML. It is useful for reading and creating XML content in a (157) editor. It is then easily transformed into proper XML. SOX was created because developers can spend a great deal of time with raw XML. For many of us, the popular XML (158) have not reached a point where their tree views, tables and forms can completely substitute for the underlying (159) language. This is not surprising when one considers that developers still use a text view, albeit enhanced, for editing other languages such as Java. SOX uses (160) to represent the structure of an XML document, which eliminates the need for closing tags and a number of quoting devices. The result is surprisingly clear.

单选题在cache一主存两级存储体系中，关于cache的叙述，错误的是 (17) 。

单选题Public Key Infrastructure (PKI) service providers offer organizations fully integrated PKI-managed services designed to secure Intranet, Extranet, Virtual Private Network (VPN), and e-commerce applications. PKI solutions can enable a number of security services, including strong authentication and non-repudiation of transactions. eToken enables the users of PKI systems to generate and store (101) and digital certificates inside the token, creating a secure environment and allowing full portability and maximum ease of use. eToken Pro can also perform sensitive on-chip (102) operations, ensuring that users' keys axe never exposed to the PC environment, eToken eliminates the need to store (103) and keys on a hard disk or browser file, or to transmit them across the Internet/Extranet; assuring peace-of-mind and confidence during online communications. A digital signature is created using the private key of an individual to ensure the Validity of his request. This technology can be used to guarantee (104) of various transactions. The strength of either the authentication level or the digital signature relies on the level of protection offered to the private key. eToken Pro offers the maximum level of security, since it enables the use of the private key for signing and authenticating inside the eToken. The most secure use of authentication involves enclosing at least one certificate with every signed message. The message (105) verifies the certificate using the CA's public key. If the sender's public key is legitimate, the recipient verifies the message's signature. Digital signatures created with a private key are verified with the digital certificate containing the public key.

单选题若要重构一个功能上和性能上更为完善的改进的软件，可以使用 (125) 。

单选题编号为0、1、1、3、…、15的16个处理器，采用单级互联网络连接。当互联函数为Cube3时，11号处理器连接到 (10) 号处理器上。若采用Shuffle互联函数，则11号处理器应连接到兰 (11) 号处理器上。

单选题下面关于钓鱼网站的说法中错误的是______。

单选题UML提供了4种结构图用于对系统的静态方面进行可视化、详述、构造和文档化。其中 (17) 是面向对象系统建模中最常用的图，用于说明系统的静态设计视图；当需要说明系统的静态实现视图时，应该选择 (18) ；当需要说明体系结构的静态实施视图时，应该选择 (19) 。

单选题从A村通过B村再到C村已有一条通信线路。A村与B村问通信线路的可靠度为0.90，B村与C村间通信线路的可靠度为0.70。现在计划在A村与C村之间再直接建一条新的通信线路(如图14-31所示)。试问，这条新建通信线路的可靠度至少应该为(18)时，才使A村与C村之间的通信可靠度能达到0.90以上?

单选题已知某高速缓存cache采用组相联映像方式，即组间直接映像，组内全相联映像。假设主存容量为4096块，每块256B，高速缓存包含32块，分8组，每组4块。高速缓存的地址变换表应包含 (14) 个存储单元；每个存储单元应能存放 (15) 位二进制数；每次参与相联比较的是 (16) 个存储单元。

单选题面向对象技术中，对已有实例的特征稍作改变就可生成其他的实例，这种方式称为 (11) 。 分类(classification)指的是对象及其类型之间的关系。若一个对象可用n个类型表述，而这些类型不必由继承来关联的是 (12) 。 (13) 是面向对象程序设计语言中的一种机制。这种机制实现了方法的定义与具体的对象无关，而对方法的调用则可以关联于具体的对象。

单选题astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost (141) . For example, the maintenance of multiple networks can require additional staff. Often, this staff must be trained on multiple vendor technologies, sometimes requiring parallel groups specializing in each (142) . Hence, additional maintenance procedures must be maintained and administrative records are (143) . The duplication of transport facilities to carry (144) network traffic is an inefficient use of resources. And not surprisingly, more technologies installed in a central office means the necessity for more physical space and an increase in power connections and power consumption, migration of these (145) network elements to IP-based DCns is alogical strategy.

单选题申请专利的发明创造在申请之日的前6个月内，有______情形的将丧失新颖性。

单选题______图像通过使用彩色查找表来显示图像颜色。

单选题随着互联网技术的快速发展，企业门户已经成为企业优化业务模式、扩展市场渠道、改善客户服务，以及提升企业形象和凝聚力的重要手段。按照实际应用类型，企业门户可以划分为4类，分别是企业网站、企业信息门户、企业______门户和企业应用门户。为了支持跨越多个应用系统的工作流程，企业门户主要采用______技术对现有应用系统的处理逻辑进行整合。