单选题 1分

If there is any doubt as to the proper operation of a radar, which statement is true ?__________.

  • A.Only a radar expert can determine if the radar is operating
  • B.All radars have indicator lights and alarms to signal improper operation
  • C.A radar range compared to the actual range of a known object can be used to check the operation of the radar
  • D.The radar resolution detector must be energized to check the radar

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