单项选择题
A.navigation status B.ship's heading C.port of origin D.time stamp
Automatic identification systems (AIS) are expected to ...
单项选择题Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT（）.
A.Port of origin B.Name of vessel C.Course and speed over ground D.Draft of vessel
AMVER is a system which provides（）.A.satellite communic...
单项选择题AMVER is a system which provides（）.
A.satellite communications B.navigational information C.weather information D.position reporting service
A yellow signal，floating in the air from a parachute，ab...
单项选择题A yellow signal，floating in the air from a parachute，about 300 feet above the water，indicates that a submarine（）.
A.will be coming to periscope depth B.will be coming to the surface C.is on the bottom in distress D.is in distress and will try to surface
