单项选择题
A.the radio regulations
B.the technical terms and definitions
C.how to operate the GMDSS SES equipment
D.Maritime Communications
单项选择题 Stations are grouped by countries arranged in the（）order of their country symbols.
单项选择题 When engaged on international voyages, ships of 1600 tons gross tonnage and upwards shall be fitted with a（）.
单项选择题 The maritime access code of telephone mode in INMARSAT-A terminal for the AOR(W) is（）.