单项选择题
Which fire extinguishing agent can NOT be used on an ethylenediamine?（）
A.Water foam B.Dry chemical powder C.Water fog D.Alcohol foam
单项选择题 Which fire detection system is actuated by sensing a heat rise in a compartment?（）
单项选择题 Which extinguishing agent is the best for use on electrical fires?（）
单项选择题 Which extinguishing agent is recommended in the Chemical Data Guide for use on a carbon disulfide fire?（）
