A.The safety of navigation or important meteorological warnings
B.The safety of a vessel or a person is in jeopardy
C.A vessel in need of immediate assistance
D.A coast station traffic list
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A.ITU Publications
B.The manufacturers instruction manuals
C.Part 90 of the FCC Rules and Regulations
D.Code of Federal Regulations，Title 47，Part 80，Subpart W
A.VHF
B.SART
C.NAVTEX
D.LES
A.VHF
B.SART
C.NAVTEX
D.LES
A.forward error correction
B.aftward error correction
C.DGPS
D.error-free and low error reception
A.At least two years after the last entry
B.At least one year after the last entry
C.At least 90 days after the last entry
D.At least 30 days after the last entry
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The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
By using（）system a ship can send a distress message and know with certainty it will be received.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
Before GMDSS, if the radio officer on board is serious ill,（）.
Please use（）for（）.