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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1.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
2.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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