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

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單項(xiàng)選擇題

MSI is broadcast via（）.

A.NAVTEX
B.EGC
C.HF-telex
D.all of above

單項(xiàng)選擇題

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

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The GMDSS is composed of（）.

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MSI is broadcast via（）.

The existing terrestrial radio system has a number of basic flaws which（）.