单项选择题

（）means navigational and meteorological warnings, meteorological forecasts and other urgent related messages broadcast to ships.

A.Navigational broadcast
B.weather forecast
C.Urgency message
D.Maritime Safety Information

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单项选择题

A.Lifeboat
B.A survival craft
C.An EPIRB
D.A SART

单项选择题

A.COSPAS-SARSAT
B.Ground receiving stations
C.storing distress signal
D.Near-polar orbiting satellites

单项选择题

A.essential
B.compulsory
C.optional
D.inadvisable