單項選擇題Five or more short blasts on a vessel’s whistle indicates that she is（）.

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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1.單項選擇題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

2.單項選擇題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