单选题The GMDSS must combine all various subsystems, because（）.Athey all have different limitations with respect to coverageBthey all have different limitations in the technology they useCdifferent systems apply to different shipsDall of above
单选题
The GMDSS must combine all various subsystems, because（）.
A
they all have different limitations with respect to coverage
B
they all have different limitations in the technology they use
C
different systems apply to different ships
D
all of above
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