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
Please use（）for（）.
SOLAS ships shall be equipped with（）.
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.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
The advantage of geostationary satellites is（）.
（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.