在選擇多媒體數(shù)據壓縮算法時需要綜合考慮 （ ） 。
A、數(shù)據質量和存儲要求 
B、數(shù)據的用途和計算要求 
C、數(shù)據質量、數(shù)據量和計算的復雜度 
D、數(shù)據的質量和計算要求 

在MPEG系列標準中， （ ） 最適合在共用電話交換網（PSTN）上實時傳輸視頻數(shù)據。
A、MPEG-1
B、MPEG-2
C、MPEG-4
D、MPEG-7

要在網絡上發(fā)布彩色動畫文件，可以采用的存儲格式是（ ）。
A、BMP
B、JPEG
C、MP3
D、GIF

MIDI enables people to use （1） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （2） ", the Hardware Interface and a distribution （3） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （4） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （5） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.
（1）A、personal 
B、electronic 
C、multimedia 
D、network
（2）A、device 
B、protocol 
C、network 
D、controller
（3） A、format 
B、text 
C、wave 
D、center
（4）A、Video 
B、Faxmail 
C、Graphic 
D、Audio
（5） A、messages 
B、packets 
C、frame 
D、information 

 Certificates are （1） documents attesting to the （2） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to （3） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a certificate also contains an （4） date, the name of the CA that issued the certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （5） of the certificate issuer. The most widely accepted format for certificates is X.509 , thus, Certificates can be read or written by any application complying with X.509.
（1） A、text 
B、data 
C、digital 
D、structured
（2）A、connecting 
B、binding 
C、composing 
D、conducting
（3） A、impersonate 
B、personate 
C、damage 
D、control
（4）A、communication 
B、computation 
C、expectation 
D、expiration
（5）A、signature 
B、mark 
C、stamp 
D、hypertext