单项选择题
Foam extinguishes a fire by（）.
A.shutting off the air supply B.cooling the fuel to below ignition temperature C.dispersing the fuel D.removing the source of ignition
单项选择题 Flames from small leaks of LFG may be extinguished by（）.
单项选择题 Flame screens are used to（）.
单项选择题 Fixed CO2 systems would not be used on crew’s quarters or（）.
