单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
MSI is broadcast via（）.
A.NAVTEX
B.EGC
C.HF-telex
D.all of above -
单项选择题
The existing terrestrial radio system has a number of basic flaws which（）.
A.can be overcome by using traditional techniques
B.cannot be overcome by satellite system
C.can be overcome by satellite and digital techniques
D.cannot be tackled by any modern system
