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[单选题]
以下关于MPEG标准系列的叙述中,正确的是()。
A
MPEG-1是多媒体内容描述接口标准
B
MPEG-2只支持逐行扫描
C
MPEG-4引入了基于对象的编码方式
D
MPEG-21定义了视频压缩编码算法
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试题答案:
C
答案解释:
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CD-ROM的标称存储容量通常为()MB。
以下属于多媒体网络课件中的文字素材制作工具是()
Health effects of 3DSome viewers have(1)of headaches and eyestrain after watching 3D films.Motion sickness,in addition to other health concerns are more easily induced by 3D presentations.One published study shows that of those who watch 3D films nearly 55%experience varying levels of headaches,nausea and disorientation.There are two primary effects of 3D film that are(2)for human vision:crosstalk between the eyes,caused by imperfect image separation,and the(3)between convergence and accommodation,caused by the difference between an objects perceived position in front of or behind the screen and the real origin of that light on the screen.It is believed that approximately 12%of people are unable to properly see 3D(4)due to a variety of medical conditions.According to another experiment up to 30%of people have very weak stereoscopic vision preventing them(5)depth perception based on stereo disparity.This nullifies or greatly decreases immersion effects of digital stereo to them. A.trueB.irregularC.unnaturalD.orderly【小题答案】C【小题解释】A.真实的B.不规则的C.不自然的D.有序的【小题结束】 A.mismatchB.independenceC.unlikeD.disagree【小题答案】A【小题解释】A.错配、不匹配(名词/动词)B.独立(名词)C.不像、不同于(介词/形容词)D.不同意、不一致(动词)【小题结束】 A.imagesB.sculpturesC.colorationD.patterns【小题答案】A【小题解释】A.图像、影像B.雕塑C.着色、配色D.图案、纹路、模式【小题结束】 A.inB.onC.toD.from【小题答案】D【小题解释】A.in在…里面;用B.on在…之上;关于C.to到;向;对于D.from从…;来自【小题结束】
以下关于矢量图与位图的叙述中,正确的是( )。
视频信号中,关于I帧、P帧和B帧的压缩效率比较,正确的是()。
多用于显示器、手机屏幕发光显色的颜色模型是()
界面对话设计时遵循()原则,将告诉用户正处于系统的什么位置,避免用户在错误环境下发出了语法正确的命令。
下列关于元数据描述中,正确的是()。
某音频信号采样频率为44.1kHz,量化位数为16位,双声道立体声,1分钟该音频不压缩的数据量约为()MB。
基于虹膜图样识别的认证技术中,可在(1)cm的距离内采用,存储一个虹膜图样需要(2)个字节,所需时间为(3)ms。
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构成供应链的代表性要素不包括( )。
2.
梁板结构的拆模顺序是()。
3.
Many people view the term "electronic commerce" (or e-commerce) as shopping on the part of the Internet called the ( 1 ).However, electronic commerce also covers many other activities, such as businesses trading with other business and internal processes that companies use to support the buying, selling, hiring, planning and other activities. Some people use the term electronic business (or e-business) when they are talking about electronic commerce in this broader sense. For example, IBM defines electronic business as *the transformation of key business process through the use of Internet technologies." Most people use the terms “electronic commerce” and“( 2 )” interchangeably. Herein, the term electronic commerce is used in its broadest sense and includes all business activities using( 3 ).Some people categorize electronic commerce by types of entities participating in the transactions or business processes. The five general electronic commerce categories are business -to-consumer, business-to-business, business processes, consumer-to-consumer, and business-to-government, among which the following three are most commonly used:(1)Consumer shopping on the Web, often called business-to-consumer (or B2C)(2)Transactions conducted between businesses on the Web, often called business-to-business (or B2B)(3)Transactions and ( 4 ) in which companies, governments, and other organizations use Internet technologies to support selling and purchasing activities.To understand these categories better, consider a company that manufactures stereo speakers. The company might sell its finished product to consumers on the Web, which would be B2C electronic commerce. It might also purchase the materials it uses to make the speakers from other companies on the Web, which would be B2B electronic commerce. Businesses often have entire departments devoted to negotiating purchase transactions with their suppliers. These departments are usually named supply management or procurement. Thus, B2B electronic commerce is sometimes called ( 5 ).
4.
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5.
变更操作与计划操作的主要区别是( )。
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