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
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
The priority of EGC messages is classified by（）.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
（）will form the basis for distress alerting and safety calling.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
On-scene communications will normally take place between（）.
SOLAS ships shall be equipped with（）.