题目内容

How is the A3 Sea area defined by IMO ?

A. Within the coverage area of Inmarsat satellite， approximately between 76°N and 76°S， excluding Al A2 areas.
B. Within range of shore - based HF coast station with DSC function
C. Within range of shore - based MF coast station with DSC function
D. Area above 76°N and area below 76°S

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