A.a ship is threatened by grave and imminent danger and requests immediate assistance
B.a calling station has an urgent message about the safety of a person
C.the message following the prefix will be about the safety of navigation
D.the message following is a meteorological warning
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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
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
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
最新試題
The vessel was drifted off from her（）due to strong wind.
The best method to stop a vessel from dragging anchor in a sand bottom is to（）.
Which radiotelephone signal indicates receipt of a distress message?（）
The expression DROP ANCHOR means（）.
When testing a Class A EPIRB you will know the EPIRB is working properly if you hear on 99.5 Mhz FM or any vacant frequency on a nearby AM radio（）.
The expression FIRST MAGNITUDE is usually used to refer only to bodies of magnitude（）.
Fog forms when the air（）.
In radiotelephone communications，the prefix PAN-PAN indicates that（）.
The radiotelephone safety message urgently concerned with safety of a person would be prefixed by the word（）.
To predict the actual depth of water using the Tide Tables，the number obtained from the Tide Tables is（）.