单选题SQL语句“院系号NOT IN(”001”，”002”)”表示 (54) 。

单选题某本科髙校新建教务管理系统，支撑各学院正常的教学教务管理工作

单选题关于计算机病毒和特洛伊木马的说法正确的是 (46) 。

单选题已知在某数据库中有一个名为“职工”的表，则查询1975年之前出生的职工信息(姓名、性别和出生日期)的正确命令是 (64) 。职工. DBF：职工号C(10)，姓名C(10)，性别C(2)，出生日期D

单选题采用异步传输方式，设数据位为7位，1位校验位，1位停止位，则其通信效率为 (46) 。

单选题计算机网络的功能十分强大，总结起来其主要表现在 (20) 。 ①硬件资源共享 ②软件资源 ③数据

单选题Typically, these are concern with the establishment of (66) the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (67) interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be (68) For example, one computer may be a small single -user computer, while another may be a large (69) system. In the earlier days of computer communication, these issues meantthat only closed communities of computers ( that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network. Architecture (SNA) and DEC's Digital Network Architecture (DNA) are just two examples of Communication software packages produced by manufacturers to allow their systems to be int erconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (70) , in the late 1970s, formulated a reference model to provide a common basis ( or the coordination of standards developments and to allow existing and evolving standards activities to beplaced into perspective with one another.

单选题内存采用段式存储管理有许多优点，但“( 6 ) ”不是其优点。

单选题目前，被国际社会广泛认可和应用的通用压缩编码标准大致有如下四种： (62) 。

单选题数据的物理存储结构，对于程序员来讲，( )。

单选题 网络管理在网络中起着非常重要的作用，其主要功能有{{U}} {{U}} 36 {{/U}} {{/U}}；其中，对路由器的操作属于{{U}} {{U}} 37 {{/U}} {{/U}}；对于各链路流量，吞吐率的操作等属于{{U}} {{U}} 38 {{/U}} {{/U}}。 ①配置管理 ②故障管理 ③安全管理 ④性能统计 ⑤计费

单选题保证并发调度的可串行化，是为了确保事务的( )。

单选题下列关于压缩编码方法的描述中，错误的是______。

单选题软件维护是一项非常复杂和困难的工作，以下哪个不属于其表现 (42) 。 A) 以前的程序有错误 B) 读他人程序中的困难 C) 维护和开发人员不是一批人 D) 维护和开发的时间不同

单选题若对关系R1按（）进行运算，可以得到关系R2。

单选题以下有关网络操作系统和分布式操作系统的说法正确的是 (18) 。

单选题进程控制一般是由操作系统的内核来实现，它是加在硬件上的第一层软件，通过原语来实现各种控制和管理功能，它具有 (63) 的功能。 ①创建进程 ②撤销进程 ③进程通信 ④资源管理