A.MAYDAY sent by radiotelephone
B.Continuous sounding of fog horn
C.Green star shells fired from a launcher
D.Square flag and ball in a vertical line
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A.abandon ship
B.assist in taking whatever action is necessary to avoid collision
C.hold course and speed
D.sound a distress signal
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Acknowledgement by you of receipt of a distress message from a vessel which，beyond any possible doubt，is not in your vicinity and is a long distance away must be made when（）.
After launching，an inflatable raft should be kept dry inside by（）.
You are proceeding to a distress site. The survivors are in liferafts. What will make your ship more visible to the survivors?（）.
A person who sees someone fall overboard should（）.
Distress signals may be（）.
All of the following are distress signals EXCEPT（）.
What is NOT a distress signal?（）
ALL PASSENGERS OF DECK NO.2 ARE REQUESTED TO FOLLOW THE CREW MEMBERS WHO WILL ESCORT YOU TO YOUR ASSEMBLY STATIONS. From this sentence you can concluded that the vessel is in（）.
ALL PASSENGERS OF DECK NO.2 ARE REQUESTED TO FOLLOW THE CREW MEMBERS WHO WILL ESCORT YOU TO YOUR ASSEMBLY STATIONS. From this sentence you can concluded that the vessel is in（）.
At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is（）.