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Text File  |  1999-10-22  |  282b  |  13 lines

  1. High-frequency radio signals become weak and distorted 
  2.  
  3. Frequencies up to 40 MHz or higher are normally usable for long-distance communication
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  5. Frequencies up to 100 MHz or higher are normally usable for long-distance communication
  6.  
  7. High-frequency radio signals are absorbed
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