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?（）
A.NAVTEX B.EGC C.AMVER D.DSC
单项选择题 Which step should normally be taken FIRST by those who have boarded a liferaft in an emergency?（）
单项选择题 Which statement pertaining to log keeping is TRUE?（）
单项选择题 Which statement concerning the navigation of a vessel in ice is FALSE?（）
