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  第71题      
  章/节:   专业英语       

 
Digital data can also be represented by(71)signals by use of a modem. The modem converts a series of binary voltage (72) into an analog signal by encoding the digital data onto a carrier frequency. The resulting signal occupies a certain spectrum of (73) centered about the carrier and may be propagated across a' medium suitable for that carrier. The most common modems represent digital data in the voice (74) and hence allow those data to be propagated over ordinary voice-grade (75) lines. At the other end of the line, another modem demodulates the signal to recover the original data.
 
 
  A.  analog
 
  B.  digital
 
  C.  modem
 
  D.  electric
 
 
 

 
  第74题    2019年下半年  
   73%
ICMP is short for Internet (71) Message Protocol, and is an integral part of the Internet (72) suite (commonly referred ..
  第75题    2011年上半年  
   63%
The presentation layer is concerned with the(71)and semantics of the information exchanged between two systems. The proc..
  第74题    2017年下半年  
   55%
The Hypertext Transfer Protocol , the Web's (71)protocol , is at the heart of the Web. HTTP is implemented in two prog..
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