A.digital codes
B.code messages
C.norse codes
D.distress messages
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A.DSC
B.MSI
C.EGC
D.NBDP
A.Navigational broadcast
B.weather forecast
C.Urgency message
D.Maritime Safety Information
A.Lifeboat
B.A survival craft
C.An EPIRB
D.A SART
A.COSPAS-SARSAT
B.Ground receiving stations
C.storing distress signal
D.Near-polar orbiting satellites
A.essential
B.compulsory
C.optional
D.inadvisable
最新試題
All coast radio stations（）DSC installed for VHF and HF.
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.
The advantage of geostationary satellites is（）.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Radio communication（）for many years and helps to save tens of thousands of lives.
We consider（）send a helicopter with medical facilities to the distress area.
Radio beacon can be activated（）in case of distress.
Before GMDSS, if the radio officer on board is serious ill,（）.