单选题 1分

_____the INMARSAT system ,a ship can send a distress message and know with certainty it will be rece...

_____the INMARSAT system ,a ship can send a distress message and know with certainty it will be received by others
  • A.By using
  • B.With using
  • C.To use
  • D.Through the use

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1 单选题 1分
  • A. Emergency phase.
  • B. Distress phase
  • C. Alert phase.
  • D. Uncertainty phase.
3 单选题 1分
  • A. communication methods
  • B. signaling methods
  • C. rockets and hand flares.
  • D. All are right
4 单选题 1分
  • A. continuously
  • B. on terrestrial communication system
  • C. on satellite communication system
  • D. both B and C.
5 单选题 1分
  • A. aren’t moving
  • B. are stationary
  • C. are in geostationary orbits
  • D. are in the polar orbits.