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单项选择题

A.TTTB.The spoken word PANC.The spoken word SECURITED.X……

The radiotelephone message that indicates a station is about to transmit a message concerning the safety of navigation or important meteorological warnings commences with（）.

A.TTT
B.The spoken word PAN
C.The spoken word SECURITE
D.XXX

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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

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

单项选择题The urgency signal concerning the illness of persons on board ship is（）.

A.MAYDAY
B.PAN
C.SECURITE
D.ATTENTION