单项选择题
A.INMARSAT SES
B.VHF/DSC or MF/DSC
C.SART and VHF/DSC
D.satellite EPIRB and VHF/DSC
单项选择题 On receipt of a distress alert, the SAR units ashore and at sea will（）soonest.
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.