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
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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
A.LES
B.ESA
C.NCS
D.EGC
最新試題
The advantage of geostationary satellites is（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
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.
Ship-to-ship distress alerting should be conducted by（）.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
By using（）system a ship can send a distress message and know with certainty it will be received.
The vessel has stayed in port for seven days because she needs（）.
Radio beacon can be activated（）in case of distress.
At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.
All coast radio stations（）DSC installed for VHF and HF.