单选题Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (71) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (72) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim's address book, previous emails, web pages (73) . As administrators seek to block dangerous email attachments through the recognition of well-known (74) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users. Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (75) access to your network.
单选题MPEG-4是基于对象的编码方式,它引入了VO的概念来实现基于内容的表示,以下不是VO描述信息的是 (38) 。 A.运动信息 B.形状信息 C.纹理信息 D.时间信息
单选题MPEG-1视频编码标准中引入了在H.261标准中没有定义的 。 A.I帧 B.P帧 C.B帧 D.Y帧
单选题ISO制定并发布的 标准是多媒体内容描述接口标准。
单选题
单选题一张标准的单层BD盘片的存储容量可以达到 。 A.15GB B.25GB C.17GB D.50GB
单选题下面( )不是计算机多媒体系统具有的特征。
单选题以下音频编码方法和标准中, 应用了感知编码方法,它利用了人的听觉感知特性,设计心理声学模型,从而实现高效率的数字音频压缩。
单选题哈夫曼编码采用的是 (32) 编码定理。
单选题以下不是多媒体计算机技术发展中有代表性的系统的是 (5) 。 A.HyperCard B.Macintosh C.CD-I D.Amiga
单选题某公民受某单位委托所开发的软件,则该软件的著作权属于______。
单选题某机器的字长为8,符号位占1位,数据位占7位,采用补码表示时的最小整数为______。 A.-28 B.-27 C.-27+1 D.-28+1
单选题Originally introduced by Netscape Communications, (66) are a general mechanism which HTTP Server side applications, such as CGI (67) , can use to both store and retrieve information on the HTTP (68) side of the connection. Basically, Cookies can be used to compensate for the (69) nature of HTTE The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (70) .
单选题页式存储系统的逻辑地址由页号和页内地址两部分组成,地址变换过程如下图所示。假定页面的大小为8K,图中所示的十进制逻辑地址9612经过地址变换后,形成的物理地址a应为十进制 。
单选题“<title style=”italic>science</title>”是XML中一个元素的定义,其中元素的内容是 。 A.title B.style C.italic D.science
单选题下列软件产品中用于编辑静态图像的工具软件是 。 A.Authorware B.Photoshop C.3ds Max D.Cool Edit
单选题对我国计算机软件著作权的保护范围,下列______不属于保护范围。
单选题在JPEG的基于DCT的基本系统中使用的AC系数行程编码的码字,共使用两个字节表示,其中第2个字节存放的是 (34) 。
单选题软盘使用前先要进行格式化(FORMAT),这是为了确定 (22) 。光盘存储器利用光束在记录表面上读写信息,使用的是 (23) 。光盘当前受到用户重视因其有下述突出优点: (24) 。一台高性能9磁道、半英寸(1英寸=25.4 mm)的磁带机,记录密度是 256 B/mm,带速4 m/s,启停时间10 ms,带长900m,以EBCDIC码按块记录文件,每个记录长为128 B,块间间隔10 mm,块化系数为16,那么整盘磁带的记录容量最接近 (25) B(取整数)。从磁带上读出全部记录,需要 (26) ms时间。
单选题对于分量视频、复合视频和S-video,以下说法不正确的是 。
