单项选择题 Pan-Pan repeated three times over the radiotelephone indicates which type of message will follow?（）

单项选择题 Place on deck, in mess rooms,etc.,assigned to crew and passengers, where they have to meet according to the muster list when the corresponding alarm is released or announcement made means（）.

单项选择题 Public address system: loudspeakers in the vessel’s cabins, mess rooms, ETC., and on deck via which important information can bebroadcast from a central point, mostly from the navigation bridge defines（）.