单选题若某整数的16位补码为FFFFH(H表示十六进制),则该数的十进制值为______。
单选题CPU与I/O设备间的接口是 (16) ,它接收从CPU发来的命令,然后去控制I/O设备工作,从而使处理机从繁杂的设备控制事务中解脱出来。
单选题 (66) is a collection of web pages connected together with (67) . Each document or page has a unique address that allows you to find it among the millions of other documents on the Web. The address is called a (68) (URL) or sometimes a Uniform Resource Indicator (URL). When you chose a new link by clicking on it or by typing it into the address field your (69) sends a request for that document and displays it on the screen. That link can be to a different section of the current document, another document on the same website as the original or on another website anywhere in the world. Web pages are designed using (70) or HTML.
单选题
单选题网络开发生命周期各个阶段都要产生相应的文档。其中,需求说明书用于描述______。
单选题IEEE802定义的局网参考模型中,只包括了物理层和数据链路层,其中LLC通过其LLC地址为高层提供服务访问的接口,这个接口是 (35) ,在LLC帧中,广播地址是通过 (36) 表示的,将数据链路层划分成LLC和MAC,主要目的是 (37) 。在CSMA/CD传输控制方式中,冲突次数多的一个帧,其发送的优先程度 (38) 。在 DQDB协议中,一个站点得到一个空时槽时,它可以使用或放过,这是通过 (39) 。
单选题软件工程中,可行性研究要进行一次 (55) 需求分析,系统流程图用于可行性分析中的 (56) 的描述,系统流程图是描述 (57) 的工具, (58) 工具在软件详细设计过程中不采用。
单选题分配给某校园网的地址块是202.105.192.0/18,该校园网包含 (68) 个C类网络。
单选题
某数据库中有员工关系E(员工号,姓名,部门,职称,月薪);产品关系P(产品号,产品名称,型号,尺寸,颜色);仓库关系W(仓库号,仓库名称,地址,负责人);库存关系I(仓库号,产品号,产品数量)。
单选题满足BCNF范式的关系( )。
单选题“一个事务中的诸操作要么都做,要么都不做”,这一性质是指事务的
________
。
单选题As mentioned above, C imposes relatively few built - in ways of doing things on the program- mer. Some common tasks, such as manipulating (66) , (67) , and doing (68) (I/O), are performed by calling on library functions. Other tasks which you might want to do, such as creating or listing directories, or interacting with a mouse, or displaying windows or other (69) elements, or doing color graphics, are not defined by the C language at all. You can do these things from a C program, of course, but you will be calling on services which are peculiar to your programming environment (70) , processor, and operating system) and which are not defined by the C standard. Since this course is about portable C programming, it will also be steering clear of facilities not provided in all C environments.
单选题数据挖掘的目的在于 (58) 。
单选题软件概要设计是软件设计过程中一个非常重要的步骤下面哪个不属于该阶段的基本任务: (34) 。
单选题通过反复使用保证无损连接性,又保持函数依赖的分解,能保证分解之后的关系模式至少达到________。
单选题当图像分辨率为800×600,屏幕分辨率为640×480时,(13).
单选题在互联的网络设备中,交换机的工作与网桥相比,区别在于 (26) ,网桥是根据 (27) 知道它是应该转发还是应该过滤掉数据包的。交换机与HUB相比,优点是 (28) 。网桥中为了防止产生循环路径,需要运行 (29) 算法。具有自学习功能的网桥是 (30) 。
单选题( )不是分布式数据库管理系统应该遵循的准则