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单项选择题
What statement is generally correct regarding the maintenance requirements for ships under GMDSS?
A．Redundancy of functions of certain equipment will partially meet this requirement.
B．On-board maintenance provided by a person holding a Second Class Electronic Certificate license will partially meet the requirements.
C．Shore based maintenance and scheduled tests and inspections will partially meet this requirement.
D．All of the above.
B．On-board maintenance provided by a person holding a Second Class Electronic Certificate license will partially meet the requirements.
C．Shore based maintenance and scheduled tests and inspections will partially meet this requirement.
D．All of the above.
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