单项选择题
A.sufficient oxygen to sustain human life
B.an explosive mixture in the compartment
C.a toxic atmosphere in the compartment
D.All of the above
单项选择题 Fire prevention during welding or burning aboard any vessel should include （）.
单项选择题 The vapors given off by heated fuel oil are flammable, explosive, and （）
单项选择题 If a small fire initially breaks out in the engine room bilges, in which of the following sequences should the fire extinguishing agents or systems be used?（）