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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

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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

單項(xiàng)選擇題

The quality of EGC message is（）affected by the position of the ship, the time of reception and climatic condition.

A.sometimes
B.all times
C.never
D.partly

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