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
最新試題
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
The rescue coordination center may（）on stations which interfere with traffic.
The vessel has stayed in port for seven days because she needs（）.
The priority of EGC messages is classified by（）.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
Radio beacon can be activated（）in case of distress.
COSPAS-SARSAT is intended to be used for（）.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
SOLAS ships shall be equipped with（）.