问题
单项选择题
Foam extinguishes a fire by（）.
A.shutting off the air supply
B.cooling the fule to below ignition temperature
C.dispersing the fuel
D.removing the source of ignition
答案
参考答案：A
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Foam extinguishes a fire by（）.
A.shutting off the air supply
B.cooling the fule to below ignition temperature
C.dispersing the fuel
D.removing the source of ignition
参考答案：A
平面的关系，正确的是（）