A.in doubt that another vessel is taking sufficient action to avoid a collision
B.altering course to starboard
C.altering course to port
D.the stand-on vessel and will maintain course and speed
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A.SOS three times
B.Additional transmissions to aid direction finding
C.E for one minute，followed by T for one minute
D.Two tones，10-15 seconds each
A.Pan-Pan (3 times)
B.Securite Securite Securite
C.TTT TTT TTT
D.No special prefix
A.PAN-PAN
B.MAYDAY
C.SOS
D.SECURITY
A.TTT
B.SOS
C.The spoken word URGENCY
D.The spoken word PAN
A.MAYDAY
B.PAN-PAN
C.SECURITE
D.SOS
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