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 Having studied the INMARSAT document, GMDSS document, SOLAS Convention and other international navigation documents, we all know that the Chapter IV of SOLAS Convention is mainly about（）.
单项选择题 According to the basic concept of GMDSS,（）can be rapidly alerted to a distress incident.
单项选择题 Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.