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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单项选择题

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

单项选择题

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

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