单项选择题
Which fire extinguishing agent has the greatest capacity for absorbing heat?（）
A.Water B.Foam C.Dry chemical D.Carbon Dioxide
单项选择题 Which fire extinguishing agent can NOT be used on an ethylenediamine?（）
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?（）
