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  第73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.  medium
 
  B.  frequency
 
  C.  modem
 
  D.  carrier
 
 
 

 
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ICMP is short for Internet (71) Message Protocol, and is an integral part of the Internet (72) suite (commonly referred ..
  第72题    2009年上半年  
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An internet is a combination of networks connected by (71) . When a datagram goes from a source to a (72) . it will prob..
  第74题    2013年上半年  
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Traditional network layer packet forwarding relies on the information provided by network layer(71)protocols, or static ..
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