When the power of SART is on, it will（）.……

单项选择题Distress traffic（）all messages relating to the immediate assistance required by the ship in distress, including search and rescue communications and signals for locating.

A.consists of
B.is consisted of
C.consisted of
D.are consisted of

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

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