单项选择题
A.Foam B.Carbon dioxide C.Dry chemical D.Water fog
Which extinguishing agent is most effective on a mattre...
单项选择题Which extinguishing agent is most effective on a mattress fire?（）
A.CO2 B.Foam C.Dry Chemical D.Water
Which extinguishing agent is effective in combating an ...
单项选择题Which extinguishing agent is effective in combating an isoprene fire?（）
A.Dry chemicals B.CO2 C.Foam D.All the above
Which extinguishing agent is best for use on a magnesiu...
单项选择题Which extinguishing agent is best for use on a magnesium fire?（）
A.Water B.Sand C.CO2 D.Dry chemical
