单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
If EGC receiver shares a same antenna with INMARSAT MES, it means that it can receive MSI（）.
A.from any INMARSAT satellite
B.via any appropriate Navtex and EGC station
C.via the satellite the MES is tracking
D.from any RCC and coast station
