单项选择题
A.fixed B.matched C.fitted D.equal
A rectangular area is described in degrees of latitude ...
单项选择题A rectangular area is described in degrees of latitude and longitude from the latitude and longitude of the southwest corner of（）.
A.square B.triangle C.circle D.rectangle
Vessel in distress（）indicate their position by any meth...
单项选择题Vessel in distress（）indicate their position by any method.
A.cannot B.are not allowed C.have the right D.should get permission to
The list of Coast Stations is republished（）in a triling...
单项选择题The list of Coast Stations is republished（）in a trilingual.
A.every two years B.every three years C.every year D.every four years
