全國計算機等級考試四級筆試試卷-在線瀏覽
2024-09-14 13:47本頁面
【正文】 ase the number of processes sharing the CPU？ A）Interrupt B）Scheduler C）Swapping D）Working Set（61）Which of the following statements describe(s) the properties of a purely segmented memory system? Ⅰ．It divides memory into units of equal sizeⅡ．It permits implementation of virtual memoryⅢ．It suffers from internal fragmentationA）Ⅰ only B）Ⅱ only C）Ⅲ only D）Ⅰand Ⅲ（62）As an important phase in software development, software design is the continuation of software requirement analysis phase.Ⅰ．software structure Ⅱ．software procedureⅢ．software module Ⅳ．software documentwhich of the following should be included in software design phase?A）Ⅰand Ⅱ B）Ⅱand Ⅲ C）Ⅰ,Ⅱ and Ⅲ D）All（63）White box testing of software testing is a test for software structure. Which of the following item should not be included in the content of white box? A）boundary value analysis B）statement testingC）branch testing D）path testing（64）Consider a relation R ( A，B，C，D ) with the following dependencies：AB ? C, CD ? E, DE ? B.A candidate key of this relation isA）AB B）ABC C）ABD D）ABE（65）Let R and S be the following relations：A）3 B）4 C）5 D）6（66）The Pentium includes hardware for both segmentation and paging. Both mechanisms can be disabled, allowing the user to choose from four distinct views of memory. Now the most frequently used view(such as Unix System V) isA）Unsegmented unpaged memory B）Unsegmented paged memoryC）Segmented unpaged memory D）Segmented paged memory（67）ASCII is a 7bit code used to represent numeric, alphabetic, and special printable characters. It also includes codes for control characters, which areA）printable or displayable B）not printable or displayableC）not printable but displayable D）printable but not displayable（68）In most wide area networks, the munication subnet consists of two distinct ponents：transmission lines andA）networts B）switching elements C）puters D）data terminal equipment（69）To acmodate the longest path allowed by ,the slot time has been set to 512 bit times,orA） B） C） D）512μs（70）TCP(Transmission Control Protocol) was specifically designed to provide a reliable endtoend byte stream over a(n) A）IP address B）reliable network C）socket D）unreliable internetwork二、論述題（四個論述題可任選其一，并只選其一，多選無效，滿分30分）論述題答題必須用藍、黑色鋼筆或圓珠筆寫在論述題答題紙的相應(yīng)位置上，否則無效。目錄文件采用鏈接結(jié)構(gòu)，假設(shè)每個目錄下最多允許建立60個文件或目錄（統(tǒng)稱為下級文件）。假設(shè)圖中所示的文件目錄結(jié)構(gòu)中，文件或子目錄按自左向右的次序建立，而符號…表示尚有其他文件或子目錄未列出。（1）假設(shè)每個物理塊能存放128個地址（物理塊塊號），那么，普通文件的大小最大為多少塊？（3分）（2）若要讀/A/D/G/I/K的第7461塊，系統(tǒng)最少啟動硬盤幾次，最多幾次？（6分）2．若普通文件采用順序結(jié)構(gòu)，
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