单项选择题
Which extinguishing agent is NOT recommended in the Chemical Data Guide for use on a cyclohexane fire?（）
A.Foam B.Carbon dioxide C.Dry chemical D.Water fog
单项选择题 Which extinguishing agent is most effective on a mattress fire?（）
单项选择题 Which extinguishing agent is effective in combating an isoprene fire?（）
单项选择题 Which extinguishing agent is best for use on a magnesium fire?（）
