单项选择题
A.Water B.Foam C.Dry chemical D.Carbon Dioxide
Which fire extinguishing agent can NOT be used on an et...
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
Which fire detection system is actuated by sensing a he...
单项选择题Which fire detection system is actuated by sensing a heat rise in a compartment?（）
A.Manual fire detection system B.Automatic fire detection system C.Smoke detection system D.Watchman's supervisory system
Which extinguishing agent is the best for use on electr...
单项选择题Which extinguishing agent is the best for use on electrical fires?（）
A.Foam B.CO2 C.Dry chemical D.Water fog
