单项选择题

Which channel is designated for VHF Digital Selective Calling?

A.Channel
B.Channel
C.Channel
D.Channel
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单项选择题
Which radio equipment is not necessary for the ships sailing in the sea area A2?
A.MF
B.VHF
C.VHF
D.VHF
单项选择题
What is the minimum requirement of a GMDSS operator?
A.GMDSS
B.Third
C.General
D.General
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