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
单项选择题 AMVER is a system which provides（）.
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（）.
单项选择题 A rigid replica of the International Code flag A may be shown by a vessel（）.
