( )用于加入声音,( )用于加入视频。 A: <;audio>; <;video>; B: <;video>; <;audio>; C: <;audio>; <;audio>; D: <;video>; <;video>;

Questions for video 21) What is the topic of this video clip?

Video encoder is also called video server, or DVS (Digital Video Server) for short. It is mainly used to encode and compress analog video signals and provide network transmission function. The difference with DVR products is that DVS focuses on the "video recording" function. ( )

关于video标签的描述，下面说法正确的是（）。 A: video是一个视频标签 B: video是一个音频标签 C: video标签中可以添加autoplay属性 D: 在<;video>;和<;/video>;之间可以插入文字

The function of the video distributor is one channel of video input and multiple channels of video output, with the functions of impedance matching and signal amplification. ( )

认真看以上视频，依次在下方列出视频中出现的所有时间状语从句： Video 1: ______________________________________________________________________________________ Video 2: ______________________________________________________________________________________ Video 3: ______________________________________________________________________________________ Video 4: ______________________________________________________________________________________

Watch the video and choose the best answers. 1. What is the video about?

Watch the video and match the sentences.(副本) Watch the video and match the sentences.

In order to enable the computer to process the video, the analog video signal of the video source must be converted into a meter.The digital video form required by the computer is stored on the disk. This process is called the video () process. A: Sampling process B: ,Quantification process C: ,Decoding process D: ,Digitization process

Video 4: Video 4 not only introduced the origin of paper-cuts but also the features.