单项选择题
A vessel showing a yellow light over a white light at night is a vessel（）.
A.engaged in piloting
B.towing astern
C.engaged in fishing
D.in distress
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A message warning of a tropical storm should be sent as a(n)（）.
A.routine message
B.urgent message
C.distress message
D.safety message -
单项选择题
A crew member has just fallen overboard off your port side. Which action should you take?（）.
A.Immediately put the rudder over hard right
B.Immediately put the rudder over hard left
C.Immediately put the engines astern
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单项选择题
（）of the following messages is allowed to be transmitted on the radiotelephone without the authority of the Master.
A.Urgency signal
B.Safety signal
C.Distress signal
D.None of the above
