单项选择题
Actuating the CO2 fixed system causes the shutdown of the（）.
A.fuel supply B.exhaust ventilation C.supply and exhaust ventilation D.mechanical and natural ventilation
单项选择题 A safety outlet is provided on the CO2 discharge piping to prevent（）.
单项选择题 A fire in the galley ALWAYS poses the additional threat of（）.
单项选择题 A fire in a ballast pumproom can be brought under control with minimal impact on stability by（）.
