A.B2
B.B1
C.MAR
D.NNN
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A.frequency allocated
B.both language and frequency
C.language used
D.transmission power and time
A.10 minutes every 4 hours
B.half an hour every other hour
C.irregular period of time
D.5 minutes every two hours
A.in any INMARSAT regions
B.in each NAVTEX area
C.at any distance
D.in Areas A3 and A4
A.navigational / typhoon
B.traffic / meteorological
C.marine / hurricane
D.navigational / meteorological
A.dedicated system
B.MSI broadcasts
C.518KHZ
D.channel 16
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（）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.
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.
Please use（）for（）.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
SOLAS ships shall be equipped with（）.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
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.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
What following is not among the function of SOLAS ships?（）