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（）.
A.immediate danger to collide with another vessel B.a situation in which more passengers will embark on board C.berth and ready to disembark her passengers D.distress
单项选择题 All of the following are distress signals under the Rules EXCEPT（）.
单项选择题 All of the following are distress signals EXCEPT（）.
单项选择题 After putting on a self-contained breathing apparatus，you open the air supply and hear a continuous ringing of a bell. What does this mean?（）.
