单项选择题
A.Mobile Satellite Information
B.Motor ship Identification
C.Most Serious Information
D.Maritime Safety Information
单项选择题 The FEC mode is for（）from（）station to two or more other stations when available.
单项选择题 The SART should have sufficient battery capacity to operate in the stand-by condition for（）hours and should continuously work for（）hours.
单项选择题 It is required that ships proceeding at sea should keep continuous watch on（）.