单项选择题
A SART can be fixed on（）.
A.a mother ship B.a lifeboat C.a life craft D.all of A,B,C
单项选择题 All stations which receive a distress alert shall immediately cease（）.
单项选择题 When receiving a distress alert, the SAR authorities ashore and the ships in the vicinity of the ship in distress will（）soonest.
单项选择题 In the GMDSS, distress alerting can be transmitted in（）directions.
