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20xx年計算機等級四級筆試試卷-考試學(xué)習(xí)(文件)

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【正文】 software structure. Which of the following item should not be included in the content of white box? A) boundary value analysis B) statement testing C) 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 is A) 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) is A) Unsegmented unpaged memory B) Unsegmented paged memory C) 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 are A) printable or displayable B) not printable or displayable C) not printable but displayable D) printable but not displayable ( 68) In most wide area works, the munication sub consists of two distinct ponents: transmission lines and A) worts 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,or A) 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 work C) socket D) unreliable interwork 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(lán)、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。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。( 15 分) 論述題 3 在 學(xué)生 選課 課程 數(shù)據(jù)庫中有三個關(guān)系: S( S, SNAME, SEX, AGE, SD), SC( S, C, GRADE), C( C, CNAME, TEACHER)。; create view S_G(S, GAVG) as select S, avg(GRADE) from SC group by S ; 若用下面的 SQL 語句對上述視圖進(jìn)行修改,它們能被成功執(zhí)行嗎?為什么? (1) update CS_S set SNAME =39。; (這里假定在表 S中存在學(xué)生號 S = 39。20xx0218939。20xx0218939。; (這里假定在表 SC 中存在學(xué)生號 S = 39。 論述題 4 網(wǎng)絡(luò)安全策略設(shè)計的重要內(nèi)容之一是:確定當(dāng)網(wǎng)絡(luò)安全受到威脅時應(yīng)采取的應(yīng)急措施。( 9 分) 參考答案 : 一、 選擇題 ( 1) A ( 2) C ( 3) D ( 4) C ( 5) A ( 6) B ( 7) C ( 8) A ( 9) C ( 10) D ( 11) C ( 12) B ( 13) A ( 14) B ( 15) C ( 16) D ( 17) C ( 18) B ( 19) A ( 20) A ( 21) B ( 22) D ( 23) D ( 24) D ( 25) D ( 26) D ( 27) A ( 28) C ( 29) D ( 30) A ( 31) D ( 32) A ( 33) A ( 34) B ( 35) C ( 36) D ( 37) A ( 38) B ( 39) D ( 40) D ( 41) A ( 42) B ( 43) D ( 44) C ( 45) B ( 46) A ( 47) D ( 48) B ( 49) B ( 50) C ( 51) B ( 52) D ( 53) C ( 54) B ( 55) A ( 56) C ( 57) C ( 58) B ( 59) A ( 60) C ( 61) B ( 62) D ( 63) A ( 64) C ( 65) B ( 66) D ( 67) B ( 68) B ( 69) C ( 70) D 二、論述題 論述題 1 1.( 1) 10+128+1282+1283 塊 ( 2)最少啟動硬盤 8 次,最多啟動硬盤 23
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