A.INMARSAT A
B.INMARSAT C
C.SafetyNET
D.NAVTEX
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A.VHF
B.SART
C.NAVTEX
D.LES
A.Sea Area A1
B.Sea Area A2
C.Sea Area A3
D.Sea Area A4
A.Search and rescue authorities ashore can be alerted to a distress situation
B.Shipping in the immediate vicinity of a ship in distress will be rapidly alerted
C.Shoreside authorities and vessels can assist in a coordinated SAR operation with minimum delay
D.All of the above
A.No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency
B.The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received
C.The Operator should immediately set continuous watch on VHF channel 70
D.The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received
A.A compulsory vessel must carry at least two (2) licensed GMDSS operators
B.A compulsory vessel must satisfy certain equipment carriage requirements that are determined by where the vessel sails
C.A compulsory vessel must be able to transmit and respond to distress alerts
D.All of the above
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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.
The vessel has stayed in port for seven days because she needs（）.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
（）will form the basis for distress alerting and safety calling.
Radio beacon can be activated（）in case of distress.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
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.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
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.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.