At sea，all required GMDSS equipment（other than survival craft equipment）must be proven operational by（）.

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• What are the vessel equipment and personnel requirements for GMDSS? （）

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• Which statement concerning GMDSS Radio Operator requirements is FALSE（）.

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• The GMDSS defines four sea area based on the（）.

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• 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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