單項(xiàng)選擇題

The COSPAS-SARSAT 406MHZ system was adopted as an element of the GMDSS by IMO in（）.

A.1992
B.1980
C.1984
D.1988

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單項(xiàng)選擇題

COSPAS-SARSAT has the function of（）.

A.distress alerting
B.communication
C.broadcasting MSI
D.on-scene communication

單項(xiàng)選擇題

SafetyNet is a maritime safety information broadcast service offering（）on suitably equipped ships.

A.free reception
B.free transmission
C.dedicated reception
D.dedicated transmission