单项选择题
A.posting a fire watch in the immediate area
B.providing an extinguisher which is ready for immediate use
C.requiring the fire watch to remain on post for 30 minutes after the completion of welding or burning
D.All of the above
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?（）
单项选择题 The term "discharge", as it applies to the pollution regulations, means（）.