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The ventilation system of your ship has fire dampers restrained by fusible links. Which statement is TRUE? （）
A:Fusible links must be replaced if a damper is activated
B:Fusible links are tested by applying a source of heat to them
C:Fusible links must be replaced at every inspection for certification
D:A fusible link will automatically open after a fire is extinguished and reset the damper

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出自：海船船员证

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