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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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