單項(xiàng)選擇題The transmission of a（）indicates that a ship is in distress and requires immediate assistance.
A.urgent traffic
B.distress alert
C.routine traffic
D.NAVTEX message
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1.單項(xiàng)選擇題The GMDSS is composed of（）.
A.satellite and terrestrial communication systems
B.only navigational and alerting systems
C.just MSI system and locating system
D.SAR co-ordination system
2.單項(xiàng)選擇題MSI is broadcast via（）.
A.NAVTEX
B.EGC
C.HF-telex
D.all of above
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