单项选择题 Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）

单项选择题 A person on a fixed, or floating platform engaged in oil exploration, located 10 nautical miles from nearest land MAY discharge （）.

单项选择题 Fires resulting from spontaneous combustion are usually caused by the improper disposal of（）.