單項選擇題The urgency signal concerning the illness of persons on board ship is（）.
A.MAYDAY
B.PAN
C.SECURITE
D.ATTENTION
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1.單項選擇題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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