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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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单选题Which statement is TRUE（）.A
GMDSS radio logs are required to contain entries pertaining to all incidents connected to radio communication service which appear to be of importance to the safety of life at seaB
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all of the parts，dividing the load equallyB
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Each compulsory vessel must carry at least two licensed GMDSS Radio Operators at all times while at seaB
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The Volume Groups must be changed with chvg -E vgname.B
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The Volume Groups must be a member of a resource group and must be varied off all nodes of the cluster.D
The Volume Grups cannot be changed to enhanced concurrent capable because they must be recreated with mkvg -C vgname.
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