题目内容

Which system is most likely to be affected by atmospheric disturbances？

A. VHF DSC
B. INMARSAT Standard-C
C. MF/HF radiotelephony
D. Safety NET

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In which sea areas(s), INMARSAT service are available？

A. Sea Area A3 only
B. Sea Area A1, A2 and A3
C. Sea Area A3 is included
D. Excluding sea area A1