A.Urgency signal
B.Safety signal
C.Distress signal
D.None of the above
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A.a floating wreck
B.a survivor at sea
C.a man who had fallen overboard
D.a drilling rig
A.a message about the safety of navigation will follow
B.a message of an urgent nature about the safety of a ship will follow
C.the sender is in distress and requests immediate assistance
D.you should secure your radiotelephone
A.Safety message
B.Urgency message
C.Distress message
D.Routine message
A.at
B.on
C.in
D.above
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