单选题图像数据的特点之一是43_________ 。

单选题44.声音采样原理中，为了能够还原被采样的声音，采样频率不得低于信号源________________

单选题超文本是一个________________的________________结构

单选题38.________________不属于虚拟现实的技术特征

单选题16.以下关于行程编码叙述中，正确的是________________

单选题CA替用户产生密钥对，然后将其以安全的方式传送给用户，该过程必须确保密钥对的机密性、完整性和39_________。

单选题45.数据KKKKKBBBBTEEEEEEEEEOOOOOOOO，使用行程编码(行程长度用1字节存储)对其进行压缩，所需存储量为________________字节

单选题DVD数字光盘采用的视频压缩标准为49_________。

单选题虚拟现实系统的三个重要特征是55_________。

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