单项选择题
A.is 50% water saturated B.is 90% water saturated C.temperature is greater than the dew point temperature D.temperature is equal to，or below the dew point temperature
Five or more short blasts on a vessel’s whistle indicat...
单项选择题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
After a vessel transmits the original distress message，...
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
A message giving warning of a hurricane should have whi...
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
