单项选择题
The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.
A.SOS
B.XXX
C.TTT
D.PAN
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相关考题
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单项选择题
Which of the following indicates a grave and imminent danger requesting immediate assistance on radio telephone?（）.
A.SOS
B.Mayday
C.Securite
D.PAN -
单项选择题
Which one of the following is the safety signal?（）.
A.SSS
B.TTT
C.XXX
D.FFF -
单项选择题
Your vessel has been damaged and is taking on water，but you do not require immediate assistance. You would preface a message advising other vessels of your situation with（）.
A.Mayday-Mayday-Mayday
B.Pan-Pan (3 times)
C.Securite-Securite-Securite
D.SOS-SOS-SOS
