单选题在一个典型的电子商务应用中,三层架构(即表现层、商业逻辑层和数据访问层)常常是架构师的首选。常见的电子商务应用——网上书城的主要功能是提供在线的各种图书信息的查询和浏览,并且能够订购相关图书。用户可能频繁地进行书目查询操作,网站需要返回众多符合条件的书目并且分页显示;网站管理员需要批量对相关书目信息进行修改,并且将更新信息记录到数据库。针对前一个应用要求,架构师在数据访问层设计时,最可能考虑采用______;针对后一个应用要求,架构师最可能考虑采用______。
单选题嵌入式系统由硬件部分和软件部分构成。以下不属于嵌入式系统软件的是______。 A.系统内核 B.驱动程序 C.FPGA编程软件 D.嵌入式中间件
单选题在支持多线程的操作系统中,假设进程P创建了若干个线程,那么( )是不能被其他线程共享的
单选题信息具有许多质量属性,对于市场情报信息来说,至关重要的属性是 (36) 。
单选题 In the following essay, each blank has four choices. Choose
the best answer and write down on the answer sheet. With the
implementation of {{U}} {{U}} 5 {{/U}} {{/U}}, the so - called
network has become a reality. The provision of such facilities is the most
important part of the network requirements. However, in many applications the
communicating computers may be of different types. This means that they may use
different programming languages and, more importantly, different forms of
{{U}} {{U}} 6 {{/U}} {{/U}} interface between
user(application) program, normally referred to, as application processes, and
the underlying communication services may be {{U}} {{U}} 7
{{/U}} {{/U}}. For example, one computer may be a small single - user
computer, while another may be a large {{U}} {{U}} 8 {{/U}}
{{/U}}system. In the earlier days of computer communication, these issues meant
that only closed communities of computers (that is, from the same manufacturer)
could communicate with each other in a meaningful way. IBM's Systems Network
Architecture (SNA) and DEC's Digital Network Architecture (DNA) are just two
examples of communication software packages produced by manufacturers to allow
their systems to be interconnected together. These proprietary packages,
however, of which there am still many inexistence, do not address the problem of
universal interconnect ability, or open systems interconnection. In an attempt
to alleviate this problem, {{U}} {{U}} 9 {{/U}} {{/U}}, in the
late 1970s, formulated a reference model to provide a common basis (or the
coordination of standards developments and to allow existing and evolving
standards activities to be placed into perspective with one another.
单选题在IEEE 802.11标准中使用了扩频通信技术,以下关于扩频通信的叙述中,正确的是______。 A.扩频技术是一种带宽很宽的红外线通信技术 B.扩频技术是一种使用伪随机序列对代表数据的模拟信号进行调制的技术 C.扩频通信系统的带宽随着数据速率的提高而不断扩大 D.扩频技术就是扩大了频率许可证的使用范围
单选题 For each blank, choose the best answer from
the four choices and write down on the answer sheet. It is
claimed that Al applications have moved from laboratories to the real world.
However, conventional von Neumann computers are{{U}} {{U}} 50
{{/U}} {{/U}}for Al applications, because they are de- signed mainly for
numerical processing. In a larger yon Neumann computer, there is a larger ratio
of memory to processing power and consequently it is even less efficient.
This{{U}} {{U}} 51 {{/U}} {{/U}}remains no matter how fast we
make the processor because the length of the computation becomes dominated by
the time required to move data between{{U}} {{U}} 52 {{/U}}
{{/U}}and memory. This is called the yon Neumann{{U}} {{U}} 53
{{/U}} {{/U}}. The bigger we build the machines, the worse it gets. The way to
solve the problem is to diverse from the traditional architectures and to design
special ones for Al applications. In the research of future Al architectures, we
can take advantages of many{{U}} {{U}} 54 {{/U}} {{/U}}or
currently emerging concepts. in computer architecture, such as dataflow
computation, stack machines, tagging, pipelining, systolic array,
multiprocessing, distributed processing, database machines, and inference
machines.
单选题美国著名的卡内基梅隆大学软件工程学研究所针对软件工程的工程管理能力与水平进行了充分研究,提出了5级管理能力的模式,包括临时凑合阶段、简单模仿阶段、完成定义阶段、( )和( )
单选题M画家将自己创作的一幅美术作品原件赠与了L公司。L公司未经该画家的许可,擅自将这幅美术作品作为商标注册,且取得商标权,并大量复制用于该公司的产品上。L公司的行为侵犯了M画家的______。
单选题某集团公司下属有多个超市,假设公司高管需要从时间、地区和商品种类三个维度来分析某电器商品销售数据,那么应采用( )来完成
单选题在软件生命周期的各阶段会产生一系列的文件,如手册、数据和程序,它们总称为 (43) 。
单选题某单位的用户购买了一台预先安装了操作系统的 PC,后经查实,该PC 上的操作系统是盗版,而对此情况该用户并不知情,则 (12) 。
单选题某软件公司欲开发一个在线交易系统。为了能够精确表达用户与系统的复杂交互过程,应该采用UML的 (23) 进行交互过程建模。 A.类图 B.序列图 C.部署图 D.对象图
单选题在高级语言程序中,使用________访问保存在变量中的数据。
单选题网络设计过程包括逻辑网络设计和物理网络设计两个阶段,各个阶段都要产生相应的文档,下面的选项中,属于逻辑网络设计文档的是(69),属于物理网络设计文档的是(70)。
单选题A.构成对乙公司权利的侵害 B.不构成对乙公司权利的侵害 C.不侵害乙公司的权利,丙公司侵害了乙公司的权利 D.与丙公司的行为共同构成对乙公司权利的侵害
单选题信息工程方法把整个信息系统的开发过程划分为4个实施阶段,其自上而下的顺序是( )
单选题某数据库中有员工关系E(员工号,姓名,部门,职称,月薪);产品关系P(产品号,产品名称,型号,尺寸,颜色);仓库关系W(仓库号,仓库名称,地址,负责人);库存关系I(仓库号,产品号,产品数量)。
a.若数据库设计中要求:
①仓库关系W中的“负责人”引用员工关系的员工号
②库存关系I中的“仓库号,产品号”唯一标识I中的每一个记录
③员工关系E中的职称为“工程师”的月薪不能低于3500元
则①、②、③依次要满足的完整性约束是______。
b.若需要得到每种产品的名称和该产品的总库存量,则对应的查询语句为:
SELELCT 产品名称, SUM(产品数量)
FROM P, I
WHERE P.产品号=I.产品号 ______;
单选题依据《计算机软件保护条例》,对软件的保护包括 (10) 。 A.计算机程序,但不包括用户手册等文档 B.计算机程序及其设计方法 C.计算机程序及其文档,但不包括开发该软件的所用思想 D.计算机源程序,但不包括目标程序
