______ is an area within the radiotelephone coverage of at least one VHF coast station in which continuous Digital Selective Calling is available．A.Sea Area A1B.Sea Area A2C.Sea Area A3D.Sea Area A4
______ is an area within the radiotelephone coverage of at least one VHF coast station in which continuous Digital Selective Calling is available．
A.Sea Area A1
B.Sea Area A2
C.Sea Area A3
D.Sea Area A4
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