单项选择题
On receipt of a distress alert, the SAR units ashore and at sea will（）soonest.
A.coordinate in rescue operation B.send rescue vessels C.reach the area at once D.conduct a sector search
单项选择题 Any ship fitted with SES can（）and（）through the satellite system when sending a distress alert.
单项选择题 Actually, the date for entry into effect will be 1st February（）.Though the text does not tell us about it.
单项选择题 The GMDSS must combine all various subsystems, because（）.
