软件水平习题练习

软件水平考试系统分析师易错题(2015-12-2)
1题:下列对关系的叙述中( )不正确的
A.关系中的每个属性是不可分解的
B.在关系中元组的顺序是无关紧要的
C.任意的一个二维表都是一个关系
D.在关系中任意两个元组不能完全相同
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2、3、4、5、6题:在形式语言中,方法G是一个四元组G=(VN,Vr,P,Z),其中VN为(6)。若方法G的产生式集P为:  (1)Z→Bc (2)Z→Zc (3)B→Ab (4)B→Bb (5)A→Aa (6)A→a  则文法G是(7)文法,识别G的自动机为(8)。对于G来说,(9)为文法G可接受的字符串,(10)为文法G不可接受的字符串。
(6)
A.状态标志符
B.开始符
C.语句集
D.非终结符集合
(7)
A.短语
B.上下文有关
C.上下文无关
D.正则
(8)
A.图灵机
B.下推自动机
C.有穷状态自动机
D.线性界限自动机
(9)
A.aaabc
B.acbb
C.acbcab
D.acbbca
(10)
A.abbcc
B.acbc
C.aaabc
D.aabbccc
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7题:关于安全电子交易SET要达到的主要目标,下列( )说法的错误的。
A.利用SSL协议保证数据不被黑客窃取
B.隔离订单信息和个人账号信息
C.持卡人和商家相互认证,确保交易各方的真实身份
D.软件遵循相同协议和消息格式
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8题:进行系统修改时可能会产生维护的副作用,没有( )
A.修改数据的副作用
B.修改错误后,又引入了新的错误
C.修改代码的副作用
D.文档资料的副作用
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9题:基于“学生-选课-课程”数据库中的三个关系:
S(S#,SNAME,SEX,AGE),SC(S#,C#,GRADE),C(C#,CNAME,TEACHER)
若要求查找选修“数据库技术”这门课程的学生姓名和成绩,将使用关系( )。
A.S和SC.
B.SC和C
C.S和C
D.S,SC和C

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10、11、12、13、14题:In the following essay, each bland has four choices. Choose the best answer and write down on the answer sheet. With the implementation of (6) 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 (7) interface between user(application)program, normally referred to ,as application processes, and the underlying communication services may be (8). For example, one computer may be a small single-user computer, while another may be a large (9) 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 intercormected 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,(10) ,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.
(6)
A.communicationchannel
B.protocols
C.datachannel
D.publiccommunication
(7)
A.database
B.datarepresentation
C.protocols
D.datacommunication
(8)
A.same
B.similar
C.different
D.dependent
(9)
A.multi-user
B.client
C.server
D.full-user
(10)
A.DNA
B.SNA
C.theOSI
D.theISO
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15题:下面选项中正确描述了冲突域的是( )
A.传送了冲突的数据包的网络区域
B.以网桥、路由器、交换机为边界的网络区域
C.安装了路由器和集线器的网络区域
D.应用了过滤器的网络区域
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16题:JavaBean组件模型特点不包括( )
A.JavaBean组件模型是面向应用的组件模型
B.它支持可移植和可重用的Java组件的开发
C.JavaBean组件可以工作于任何Java程序应用开发工具中
D.JavaBean组件总是在程序运行时被实例化
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17题:( )信息传输的安全应保证信息在网络传输的过程中不被泄露和不被攻击。下列哪些属于攻击方法?
I.复制信息
II.剪裁信息
III.窃听信息
A.I和II
B.II和III
C.I和III
D.全部
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18题:设∫x0f(t2)=2x3,则∫10f(x)=( )。
A.1
B.2
C.3
D.4
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