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單項(xiàng)選擇題

Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT（）.

A.navigation status
B.ship's heading
C.port of origin
D.time stamp

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

AMVER is a system which provides（）.

A.satellite communications
B.navigational information
C.weather information
D.position reporting service