单项选择题
A.receive shore-to-ship distress alerting
B.transmit ship-to-shore distress alerting
C.receive message for public correspondence
D.transmit and receive locating signals
单项选择题 The existing terrestrial radio system has a number of basic flaws which（）.
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（）in a coordinated search and rescue operation with the minimum delay.
单项选择题 For ship-to-shore distress alerts, you can use（）.