A.alternation
B.alternate
C.alter
D.alternative
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A.all ships in a large sea area
B.only the sea authorities ashore
C.the SAR units ashore and at sea
D.the port radios and the coast stations
A.some
B.lots of
C.many
D.all
A.impossible
B.possible
C.easy
D.difficult
A.climate
B.sunshine
C.human beings
D.both a and b
A.One means, whether satellite or terrestrial techniques
B.Two means, whether satellite or terrestrial techniques
C.Two separate and independent means, each using different radio communication services
D.Two means, such as MF DSC and HF DSC
最新試題
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
The vessel has stayed in port for seven days because she needs（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
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.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
（）will form the basis for distress alerting and safety calling.
Ship-to-ship distress alerting should be conducted by（）.