单选题 1分

________ is safety communication between ships from the position from which the ships are normally n...

________ is safety communication between ships from the position from which the ships are normally navigated.
  • A. VHF communication.
  • B. MF communication.
  • C. INMARSAT communication.
  • D. Bridge-to-bridge communication.

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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
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  • D. both B and C.
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  • A. aren’t moving
  • B. are stationary
  • C. are in geostationary orbits
  • D. are in the polar orbits.