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1、2023年北京软件水平考试考试真题卷（2）本卷共分为1大题50小题，作答时间为180分钟，总分100分，60分及格。一、单项选择题（共50题，每题2分。每题的备选项中，只有一个最符合题意） 1.In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private key can be decrypted only wit
2、h the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secret key.（72）是（）A.lengthB.pair
3、C.sizeD.space2.某计算机主存按字节编址，主存与高速缓存Cache的地址变换采用组相联映像方式(即组内全相联，组问直接映像)。高速缓存分为2组，每组包含4块，块的大小为512B，主存容量为1MB。构成高速缓存的地址变换表相联存储器容量为 (31) bit。每次参与比较的存储单元为 (32) 个。A1B2C4D83.假设信源是由g个离散符号S1，S2，Si，Sq所组成的符号集合，集合中的每个符号是独立的，其中任一个符号Si出现的概率为P(Si)，并满足P(Si)=1。那么符号Si含有的信息量：I(Si)等于 (17) ，单位是 (18) 。A比特B信息熵CdbD无单位4.企业信息系统
4、往往是一个具有业务复杂性和技术复杂性的大系统，针对其建设，系统分析首先要进行的工作是 (45) 。系统开发的目的是 (46) 。A获得当前系统的物理模型B抽象出当前系统的逻辑模型C建立目标系统的逻辑模型D建立目标系统的物理模型5.原型化方法是一类动态定义需求的方法，_不是原型化方法所具有的特征。与结构化方法相比，原型化方法更需要_。衡量原型开发人员能力的重要标准是_。A丰富的编程技巧B灵活使用开发工具C很强的协调组织能力D快速获取需求6.Rapid application development (RAD) systems purport to lighten the developer&rs
5、quo;s (46) by making it easy to program an application with simple intuitive steps.RAD tools (47) the developer everything needed to construct a fully functional application quickly and easily. They make short work of modifying the developed product to (48) changes after the program is finished. App
6、lications developed with RAD tools are constructed as they are envisioned. As an application’s real usefulness (49) , the developer armed with RAD tools should be able to (50) on new features with little fuss.（48）是（）A.accommodateB.accountC.decreaseD.eliminate7.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
7、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。A4B8C12D168.In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with the private k
8、ey can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating a shared secr
9、et key.（73）是（）A.freeB.freelyC.locallyD.partly9.关系R(A，B，C)满足下列函数依赖：F=BC，BA，ABC，关系R的候选关键字为 (3) ，该关键模式属于 (4) 。AABBA和BCA和BCDAC和AB10.典型的人工智能语言一般包括 (1) 语言。匹配(match)、合一(unification)和Horn子句是 (2) 语言中的重要概念。 (3) 、 (4) 、 (5) 都是人工智能语言。A对象式和逻辑式B对象式和函数式C逻辑式和函数式D对象式11.某书店有一个收银员，该书店最多允许n个购书者进入。将收银员和购书者看做不同的进程，其工作流程如
10、图2-8所示。利用PV操作实现该过程，设置信号量S1、S2和Sn，初值分别为0，0，n。则图2-8中a1和a2应填入 (20) ，b1和b2应填入 (21) 。（20）是（）AV(S1)、P(S2)BV(Sn)、P(Sn)CP(S1)、V(S2)DP(S2)、V(S1)12.In a public-key cryptosystem, (71) encrypted with the public key can only be deciphered with the private key from the same (72) . Conversely, (71) encrypted with
11、the private key can be decrypted only with the public key. Users can make their public keys (73) available or place them at a key distribution center or others to access. However, the private key must be (74) safe. In public-key systems there’s no (75) to find a safe channel for communicating
12、a shared secret key.（74）是（）A.keepB.keepedC.keepingD.kept13.Rapid application development (RAD) systems purport to lighten the developer’s (46) by making it easy to program an application with simple intuitive steps.RAD tools (47) the developer everything needed to construct a fully functional
13、application quickly and easily. They make short work of modifying the developed product to (48) changes after the program is finished. Applications developed with RAD tools are constructed as they are envisioned. As an application’s real usefulness (49) , the developer armed with RAD tools sho
14、uld be able to (50) on new features with little fuss.（49）是（）A.appearancesB.emergesC.recognizesD.solves14.关系R(A，B，C)满足下列函数依赖：F=BC，BA，ABC，关系R的候选关键字为 (3) ，该关键模式属于 (4) 。A1NFB2NFC3NFDBCNF15.在数据库中，与查询有关的是 (1) ：与规范化方法有关的是 (2) ：与完整性有关的是 (3) ；与安全性有关的是 (4) ；与并发性有关的是 (5) 。A系统目录B进程管理C页式管理D索引16.通道处理机在数据传送过程中，通道选
15、择一次设备需要的时间为4.8s，传送一个字节数据需0.2s。某设备每隔500s发出一次传送一个字节数据的请求。该通道处理机进行字节多路通道传送时，通道极限流量应为 (52) 。在理想的情况下，此通道上最多可挂接 (53) 台这样的设备。A100KB/sB200KB/sC250KB/sD300KB/s17.程序设计语言Lisp与Prolog分别是 (41) ，它们的理论基础分别是 (42) 它们的数据结构分别是 (43) ，它们的程序形式分别是 (44) ，主要应用于 (45) 。A逻辑与对象B对象与逻辑C函数与逻辑D逻辑与函数18.在汉字处理系统中，每个汉字的编码占 (4) 字节：汉字字模采用1616点阵时，每个字模需用 (5) 字节；若将一级字库中3840个汉字都存放到存储器中，它将占用 (6) 字节；若在荧光屏上显示汉字，一屏24行，每行40字，需使用约 (7) 字节的汉字编码；为显示整屏信息，需要存储容易约 (8) 字节。A2B4C8D1619.典型的人工智能语言一般包括 (1) 语言。匹配(match)、合一(unification)和Horn子句是 (2
