单项选择题
A.pump from the damaged tank
B.fight a fire
C.abandon the rig
D.use the crossover system
单项选择题 The ventilation system of your ship has fire dampers restrained by fusible links. Which statement is TRUE?（）
单项选择题 The type of extinguisher which should be used for an electricity fire is（）.
单项选择题 The supply of carbon dioxide used in the fixed extinguishing system aboard a cargo vessel MUST be at least sufficient for（）.