单项选择题
A.that a distress message will follow
B.a request for assistance in searching for a man overboard
C.an urgent warning about a cyclone
D.All of the above
单项选择题 The distress message of a ship should include considerable information which might facilitate the rescue. This information should（）.
单项选择题 The color of rockets，shells，or rocket parachute flares used to indicate that the vessel is in distress and requires immediate assistance is（）.
单项选择题 On every vessel，distress signals must be stowed（）.