A.Mayday-Mayday-Mayday
B.Pan-Pan (3 times)
C.Securite-Securite-Securite
D.SOS-SOS-SOS
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A.MAYDAY
B.PAN
C.SECURITE
D.ATTENTION
A.Mayday
B.Pan-pan
C.Securite
D.Safety
最新試題
What is the normal length of anchor cable used to anchor a vessel?（）
Fog forms when the air（）.
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