A rectangular area is described in degrees of latitude and longitude from the latitude and longitude of the southwest corner of（）.

A.cannot
B.are not allowed
C.have the right
D.should get permission to

A.every two years
B.every three years
C.every year
D.every four years

A.the radio regulations
B.the technical terms and definitions
C.how to operate the GMDSS SES equipment
D.Maritime Communications