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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单项选择题

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