Q:

A _________ sine wave is not useful in data communications; we need to send a _______ signal

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A _________ sine wave is not useful in data communications; we need to send a _______ signal.


  1. composite; single-frequency
  2. single-frequency; composite
  3. single-frequency; double-frequency
  4. none of the above

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(b).single-frequency; composite

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