单项选择题
Regular foam can be used on all but which flammable liquid?（）
A.Motor gasoline B.Jet fuel C.Crude petroleum D.Alcohol
单项选择题 Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by（）.
单项选择题 Radiation spreads a fire by（）.
单项选择题 Prior to getting underway，the Master or person in charge of a ship must（）.
