单项选择题 Which topic is NOT required to be discussed at the pre-transfer conference?（）

单项选择题 Which system may be useful for messages，such as local storm warnings or a shore-to-ship distress alert，for which it is inappropriate to alert all ships in the satellite coverage area?（）

单项选择题 Which step should normally be taken FIRST by those who have boarded a liferaft in an emergency?（）