【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標準所描述的局域網(wǎng)參考模型對應于OSI參考模型的哪一(幾)層?Ⅰ.邏輯鏈路控制層Ⅱ.數(shù)據(jù)鏈路層Ⅲ.網(wǎng)絡層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,而且把每個比特的發(fā)送時間降低為A) 100ns B) 10ns C) D) 1ns(55) Internet的基本服務,如電子郵件Email、遠程登錄Telnet、文件傳輸FTP與WWW瀏 覽等,它們的應用軟件系統(tǒng)設計中都采用了A) 客戶機/服務器結構 B) 邏輯結構C) 層次模型結構 D) 并行體系結構(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。在下述結構中,硬件效率最高而軟件需求量最少的是A) 專用多功能單元 B) 陣列處理機 C) 數(shù)據(jù)流計算機 D) 多處理機系統(tǒng)(48) 所謂I/O操作是指內存與I/O設備之間進行信息交換。所謂超標量技術就是A) 把普通流水線的主頻提高 B) 多建立幾條流水線而已C) 不采用多指令分發(fā)技術 D) 細化流水、增加級數(shù)(45) 下列哪種結構是把指令和數(shù)據(jù)混合進行存儲的A) 哈佛結構 B) 馬克結構 C) D) (46) 虛擬存儲系統(tǒng)的頁式管理。這是哪個設計階段的任務?A) 需求分析 B) 概念設計 C) 邏輯設計 D) 物理設計(42) 在指令編碼設計過程中,雖然有最優(yōu)化的編碼方法,但人們仍采用A) ASCII碼進行指令編碼 B) BCD碼進行指令編碼C) 哈夫曼碼進行指令編碼 D) 等長擴展碼進行指令編碼(43) 寄存器窗口重疊技術是RISC的關鍵技術,這項技術能很好地支持過程調用和返回操作。若要對關系C執(zhí)行刪除操作,下面給出關系C的四個元組中哪個元組可以被刪除?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)庫系統(tǒng)的運行效率有關?Ⅰ.功能