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【正文】 operties,which one is connected with product running?Ⅰ．correctness Ⅱ．robustness Ⅲ．reuseA) Ⅰonly B) Ⅱonly C) Ⅰ+Ⅱ D) all of above(64) Let R and S be the relation respectively:Relation R:ABCRelation S:BCD123234678235978781The number of tuples that the result of the expression R ∞ S (Here is the natural join of relations R and S) isA) 3 B) 4 C) 6 D) 9(65) Suppose we have the relation schema R(A,B,C,D) with functional dependencies。x:=x+3。end。coendmeans Statement1 and Statement2 are to be executed in parallel. The only two atomic actions in this construct are loading the value of a variable and storing into a variable. For the program segmentx:=0；y:=O；cobeginbeginx:=l。 D) m(60) A disk scheduling mechanism in an operating system causes the disk arm to sweepback and forth across the disk surface servicing all requests in its path. This is a A) First Come First Serve B) Shortest Seek Time FirstC) Scan D) None of the above(61) The constructcobeginStatement1。 C) 233。這一類(lèi)數(shù)據(jù)通信具有哪些主要特征？Ⅰ．通信量大Ⅱ．順序性Ⅲ．突發(fā)性Ⅳ．層次性A) Ⅲ和Ⅳ B) Ⅰ和Ⅲ C) Ⅰ、Ⅱ和Ⅳ D) Ⅱ和Ⅳ(53) IEEE 802標(biāo)準(zhǔn)所描述的局域網(wǎng)參考模型對(duì)應(yīng)于OSI參考模型的哪一（幾）層？Ⅰ．邏輯鏈路控制層Ⅱ．?dāng)?shù)據(jù)鏈路層Ⅲ．網(wǎng)絡(luò)層Ⅳ．物理層A) 只有Ⅱ B) Ⅱ、Ⅲ和Ⅳ C)Ⅱ和Ⅳ D) Ⅰ、Ⅱ和Ⅲ(54) 與快速以太網(wǎng) Fatt Ethernet相同之處是：千兆位以太Gigabit Ethernet同樣保留著傳統(tǒng)的10 Mbps Ethernet的基本特征，而且把每個(gè)比特的發(fā)送時(shí)間降低為A) 100ns B) 10ns C) D) 1ns(55) Internet的基本服務(wù)，如電子郵件Email、遠(yuǎn)程登錄Telnet、文件傳輸FTP與WWW瀏 覽等，它們的應(yīng)用軟件系統(tǒng)設(shè)計(jì)中都采用了A) 客戶(hù)機(jī)/服務(wù)器結(jié)構(gòu) B) 邏輯結(jié)構(gòu)C) 層次模型結(jié)構(gòu) D) 并行體系結(jié)構(gòu)(56) An instruction that uses indrect addressing mustt contain an address of memory where A) data is stored B) a pipeline stall will be executedC) a page fault is addressedD) another address is stored(57) The principle for a stack memory to store data isA) FIFO B) FILO C) random D) other way(58) In the forest corresponding to the following binary tree，how many children does node B have？HCFIGA5BEDA) 1 B) 2 C) 3 D) 4(59) For the root of B_tree of order m,the minimal number of its children is A) 2 B) 235。在下述結(jié)構(gòu)中，硬件效率最高而軟件需求量最少的是A) 專(zhuān)用多功能單元 B) 陣列處理機(jī) C) 數(shù)據(jù)流計(jì)算機(jī) D) 多處理機(jī)系統(tǒng)(48) 所謂I/O操作是指內(nèi)存與I/O設(shè)備之間進(jìn)行信息交換。所謂超標(biāo)量技術(shù)就是A) 把普通流水線(xiàn)的主頻提高 B) 多建立幾條流水線(xiàn)而已C) 不采用多指令分發(fā)技術(shù) D) 細(xì)化流水、增加級(jí)數(shù)(45) 下列哪種結(jié)構(gòu)是把指令和數(shù)據(jù)混合進(jìn)行存儲(chǔ)的A) 哈佛結(jié)構(gòu) B) 馬克結(jié)構(gòu) C) D) (46) 虛擬存儲(chǔ)系統(tǒng)的頁(yè)式管理。這是哪個(gè)設(shè)計(jì)階段的任務(wù)？A) 需求分析 B) 概念設(shè)計(jì) C) 邏輯設(shè)計(jì) D) 物理設(shè)計(jì)(42) 在指令編碼設(shè)計(jì)過(guò)程中，雖然有最優(yōu)化的編碼方法，但人們?nèi)圆捎肁) ASCII碼進(jìn)行指令編碼 B) BCD碼進(jìn)行指令編碼C) 哈夫曼碼進(jìn)行指令編碼 D) 等長(zhǎng)擴(kuò)展碼進(jìn)行指令編碼(43) 寄存器窗口重疊技術(shù)是RISC的關(guān)鍵技術(shù)，這項(xiàng)技術(shù)能很好地支持過(guò)程調(diào)用和返回操作。若要對(duì)關(guān)系C執(zhí)行刪除操作，下面給出關(guān)系C的四個(gè)元組中哪個(gè)元組可以被刪除？CSCCCNAMETEACHERSCGRADEc1c2c3c4databasenetworkosmiszhanglingwuchen003001001021007345003069c1c2c3c4887895A) C=c1 B) C=c2 C) C=c3 D) C=c4(36) 下列因素中哪些與數(shù)據(jù)庫(kù)系統(tǒng)的運(yùn)行效率有關(guān)？Ⅰ．功能
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