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單項(xiàng)選擇題

The COSPAS-SARSAT system can provide distress alerts to the appropriate authorities（）.

A.anywhere in the world
B.at sea
C.in the air
D.ashore

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單項(xiàng)選擇題

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

A.1982
B.1980
C.1984
D.1988

單項(xiàng)選擇題

which function is the most important one of the GMDSS.（）

A.alerting
B.on-scene communication
C.safety information
D.general communication