单选题下列文件中，10_________是音频文件。

单选题What is VirtuaIReality? The definition of virtual reality comes，(71)______，from the definitions for both‘virtual’and ‘reality’．The definition of‘virtual’is near and reality is what we expenence as humanbeings．So the term‘virtual reality’basically means‘near—reality’．This could，of course，mean anything but it usually refers to a specific type ofreality(72)______． We know the Worid through our senses and(73)______systems．In school we all learned that we have five senses：taste，touch，smell，sight and hearing．These are however only our most obvious sense organs．The truth is that humans have many more senses than this，such as a sense of balance for example．These other sensory inputs，plus some special processing of sensory information by our brains ensures that We have a rich flow of information from the environment to our minds．Everything that we know about our reality comes by way of our senses．In other words，our entire experience of reality is simply a(74)______of sensory information and our brains sense-making mechanisms for that information．It stands to reason then，that if you can present your senses with made-up information，your perception of reality would also change in response to it．You would be presented with a version of reality that isn’t really there，but from your perspective it would be perceived as(75)______．Something we would refer to as a virtual reality。So，in summary,virtual reality entails presenting our senses with a computer generated virtual environment that we can explore in some fashion．

单选题由于用户对响应时间的要求苛刻，所以在多媒体数据传输过程中，最重要的是17_________。

单选题视频通信的Qos质量最高级别对分辨率的要求是15_________。

单选题在计算机网络中，实现网络数据格式与计算机数据格式的转换、网络数据接收与发送功能的硬件是18_________。

单选题下列选项中，属于“多媒体计算机”中所指的“媒体”的是2_________。

单选题18.只读光盘CD-ROM的存储容量通常为________________MB

单选题预测编码中，DPCM系统包括发送、接收和48_________三个部分。

单选题图像及音频文件在计算机中的表示形式是64_________。

单选题6.在多媒体计算机中采用YUV彩色空间，数字化后，Y：U：V通常是________________

单选题链是组成超文本的基本单位

单选题具备“使用异步传输模式、光纤做用户环路和干线、采用虚通路概念、传输速率可达干兆比特每秒”等特点的计算机网络接入技术称为21_________。

单选题多点会议系统的关键技术是4_________，它能够自动地把正确的音频和视频信号发送给每个与会者。

单选题多媒体的搜索引擎查询时针对的是34_________。

单选题14.P64K是视频通信编码标准，要支持中间格式CIF，要求P至少为________________

单选题33.以下哪种不是身份认证的服务方式________________

单选题在CDN系统中，要将用户的请求定向到最佳的节点或区域，即实现就近性判断，最关键的技术是32_________。

单选题在视差立体显示技术中，不需穿戴任何观察设备就可以直接看到立体图像的三维立体显示技术是30_________技术。

单选题在Premiere中，音量超过界限时，音量表的方块显示为13_________。

单选题1987年，我国第一个24_________模拟蜂窝移动电话系统建成并投入使用。