单选题有一个段页式虚拟存储器，其虚地址有2位段号，3位页号，9位页内位移，该地址空间中共有 (22) 虚页。A) 32 B) 16 C) 14 D) 5
单选题以下关于事务的故障与恢复的叙述中，正确的是______。
单选题有关动态增量备份的描述正确的是： （54） 。
单选题某进程有5个页面，页号为0～4，页面变换表如下所示。表中状态位等于0和1分别表示页面“不在内存”和“在内存”。若系统给该进程分配了3个存储块，当访问的页面3不在内存时，应该淘汰表中页号为 (25) 的页面。假定页面大小为4K，逻辑地址为十六进制2C25H，该地址经过变换后，其物理地址应为卜六进制 (26) 。 页号 页帧号 状态位 访问位 修改位 0 3 1 1 0 1 — 0 0 0 2 4 1 1 1 3 — 0 0 0 4 1 1 1 1
单选题以下属于DBA职责的是_______。
单选题如右图所示的并发调度，假设事务T1、T2执行前数据项X.Y的初值为X=100,Y=200。该调度执行完成后，X.Y的值为（ ）；此类不一致性称为（ ）。
单选题SQL-99标准规定的事务的4个隔离级别中，能解决幻影读现缘的级别是______。
单选题下列叙述中错误的是(26)。
单选题以下对存储过程的叙述中，不正确的是
单选题若将某有序树T转换为二叉树T1，则T中结点的后(根)序序列就是T1中结点的(27)遍历序列。例如，下图(a)所示的有序树转化为二叉树后如图(b)所示。A．先序B．中序C．后序D．层序
单选题满足两阶段封锁协议的调度一定是( )。
单选题以下关于网络层次与主要设备对应关系的描述中，配对正确的是（ ）。
单选题就相同内容的计算机程序的发明创造，两名以上的申请人先后向国务院专利行政部门提出申请，则______可以获得专利申请权。
单选题Sometimes the processes in which people are engaged are dependent upon other processes being completed first, possibly by other people. For example, on an automobile (71) , it is necessary for the body to be constructed before the doors can be added on. Attempting to add the doors first would be pointless, because there would be nowhere to attach them. Thus, if there is no body ready to have doors added, the process for adding doors has to be (72) until the process for creating the next body is complete. This is known as (73) Obviously, there are many cases where people have to wait for other people to do something. However, if everyone in such a situation is waiting for someone else to do something first, then no one will ever be able to do anything. When discussing processes, this situation is known as (74) , because all of the involved processes are effectively dead because of locks they have on resources. Usually someone in such a situation will eventually notice and abort the process, allowing normal flow to (75) , and often warning signs can even be spotted ahead of time to avoid 'it in the first place.
问答题从供选择的答案中选出应填入英语文句中()的正确的答案。 An instruction is made up of operations that (A) the function to be performed and operands that represent the data to be operated on. For example, if an instruction is to perform the operation of (B) two numbers ,it must know (C) the two numbers are. The processor's job is to (D) instructions and operands from memory and to perform each operation .Having done that, it signals memory to send it (E) instruction. A: ① skip ② smile ③ smoke ④ specify B: ① add ② added ③ adding ④ addition C: ① when ② where ③ which ④ who D: ① get ② make ③ push ④ put E: ① ant ② last ③ next ④ second
问答题从供选择的答案中选出应填入下列叙述中()内的正确答案； 设w为一个二维数组，其每个数据元素占用6个字节，行下标i从。到8，列下标i从2到5，则二维数组W的数据元素共占用(A)个字节。w中第6行的元素和第4列的元素共占(B)个字节。若按行顺序存放二维数组w，其起始地址的字节号为100，则二维数组W的最后一个数据元素的起始地址的字节号为(C)，数据元素的起始地址号为(D)。 供选择的答案 A：①480 ②192 ③216 ④144 B：①78 ②72 ③66 ④84 C：①310 ②311 ③315 ④314 D：①179 ②178 ③184 ④185
下面软件结构图的深度、第二层的宽度、A模块的扇出和B模块的扇入分别为________。