The GMDSS must combine all various subsystems, because（）.<br>A:they all have different limitations with respect to coverage<br>B:they all have different limitations in the technology they use<br>C:different systems apply to different ships<br>D:all of above

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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