单项选择题
A.the captain of a vessel in distress
B.representative of ship owners
C.an officer from port authorities
D.the pilot of a vessel entering a port in foreign country
单项选择题 An orange flag showing a black circle and square is a（）.
单项选择题 An airplane wants a vessel to change course and proceed towards a vessel in distress. The actions of the aircraft to convey this message will NOT include（）.
单项选择题 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（）.