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bechme bechme
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6 years ago
Which of the following is NOT a proprietary instant messaging (IM) service?
 
  A) Google Hangouts B) LinkedIn Messenger
  C) Yahoo Messenger D) Skype



The global positioning system is a network of 21 ________ plus 3 working spares.
 
  A) communicators B) satellites C) transponders D) base stations
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andrea63857andrea63857
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6 years ago
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2 years ago
thank you
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