软件水平习题练习

软件水平考试系统分析师易错题(2015-11-2)
1题:以下关于数据结构的基本概念的叙述中( )是错误的。
A.数据元素是数据的基本单位
B.数据项是有独立含义的数据最小的单位
C.数据结构概念包含的主要内容是数据的逻辑结构和数据的存储结构
D.数据的逻辑结构分为线性结构和非线性结构
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2题:如果对一个关系实施了一种关系运算后得到了一个新的关系,而且新的关系中的属性由该运算决定,这说明所实施的运算关系是( )
A.选择
B.投影
C.连接
D.笛卡儿积
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3题:局域网常用的拓扑结构有总线、环形、星形3种,以下关于这3种拓扑结构说法错误的是( )
A.总线网可靠性高、扩充性能好、通信电缆长度短、成本低,但当网上站点较多时会因数据冲突增多而使效率降低
B.环形网控制简单、信道利用率高通信电缆长度短、对节点接口和传输的要求较低但存在数据冲突问题
C.星形网结构简单、实现容易、信息延迟确定,但通信电缆总长度长、传输媒体不能共享
D.选用何种拓扑结构,首先要考虑采用何种媒体访问控制方法,其次要考虑性能、可靠性、成本、扩充性、实现难易以及传输媒体的长度等因素
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4题:根据质量管理的基本原理,所进行的PDCA循环,其中“D”是指( )
A.计划
B.实施
C.检查
D.处理
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5、6、7题:用Huffman(霍夫曼)算法求带权的2,3,5,7,8的最优二叉树T,那么T的权为(2)
T中有(3)处树叶,共有(4)个结点
(2)
A.45
B.50
C.55
D.60
(3)
A.4
B.5
C.6
D.7
(4)
A.6
B.7
C.8
D.9
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8题:下列关于瀑布模型的描述正确的是( )
A.瀑布模型的核心是按照软件开发的时间顺序将问题简化
B.瀑布模型具有良好的灵活性
C.瀑布模型采用结构化的分析与设计方法,将逻辑实现与物理实现分开
D.利用瀑布模型,如果发现问题修改的代价很低
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9题:若要求查找姓名中第一个字为‘刘’的学生号和姓名。下面列出的SQL语句中,( )是正确的。
A.SELECT S#,SNAME,FROM S WHERE SNAME=‘刘%’
B.SELECT S#,SNAME,FROM S WHERE SNAME=‘刘-’
C.SELECT S#,SNAME,FROM S WHERE SNAME LIKE‘刘%’
D.SELECT S#,SNAME,FROM S WHERE SNAME LIKE ‘刘-’
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10题:BSP方法的资源识别过程是按资源生命周期的四个阶段来划分的,下列( )过程属于回收或分配阶段
A.财政划分
B.应收款项
C.付账
D.普通会计
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11、12、13、14、15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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16题:电视系统采用的颜色空间是,其亮度信号和色度信号是相分离的。下列颜色空间中,( )颜色空间不属于电视系统的颜色空间。
A.YUV
B.YIQ
C.YCrCb
D.HSL
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