单项选择题
After a vessel transmits the original distress message，what signal should be sent to allow ships to take RDF bearings?（）
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
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相关考题
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单项选择题
A message giving warning of a hurricane should have which prefix when sent by radiotelephone?（）
A.Pan-Pan (3 times)
B.Securite Securite Securite
C.TTT TTT TTT
D.No special prefix -
单项选择题
A Coast Guard radiotelephone message about an aid to navigation that is off station is preceded by the word（）.
A.PAN-PAN
B.MAYDAY
C.SOS
D.SECURITY -
单项选择题
A radiotelegraph message commencing with XXX has the same meaning as a message sent by the radiotelephone commencing with（）.
A.TTT
B.SOS
C.The spoken word URGENCY
D.The spoken word PAN
