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單項選擇題

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

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

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單項選擇題

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

單項選擇題

The information flow of the MSI broadcast must be controlled（）.

A.to avoid mutual interference
B.to keep silence
C.owing to the time-share nature
D.to regulate transmitter power

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