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單項(xiàng)選擇題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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1.單項(xiàng)選擇題Which of the following indicates a grave and imminent danger requesting immediate assistance on radio telephone?（）.

A.SOS
B.Mayday
C.Securite
D.PAN

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2.單項(xiàng)選擇題Which one of the following is the safety signal?（）.

A.SSS
B.TTT
C.XXX
D.FFF

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3.單項(xiàng)選擇題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

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4.單項(xiàng)選擇題The urgency signal concerning the illness of persons on board ship is（）.

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

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5.單項(xiàng)選擇題If you wished to transmit a message by voice concerning the safety of navigation，you would preface it by the word（）.

A.Mayday
B.Pan-pan
C.Securite
D.Safety

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