单项选择题
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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A.a test from the alternative power supply，if installed
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