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 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（）.
单项选择题 At least（）two-way VHF radiotelephone apparatus shall be provided on every cargo ship of 300 tons gross tonnage and upwards but less than 500 tons gross tonnage.