单项选择题
Triethylene glycol fires may be extinguished by（）.
A.dry chemical B.alcohol foam C.carbon dioxide D.All of the above
单项选择题 Traditionally，the signal for fire aboard ship is（）.
单项选择题 To remedy a leaking fire hose connection at the hydrant，secure the valve and（）.
单项选择题 To prevent the spread of fire by conduction you should（）.
