问题
单项选择题
What is required in addition to the heat，fuel，and oxygen of the fire triangle to have a fire?（）
A.Electricity
B.Chain reaction
C.Pressure
D.Smoke
答案
参考答案：B
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What is required in addition to the heat，fuel，and oxygen of the fire triangle to have a fire?（）
A.Electricity
B.Chain reaction
C.Pressure
D.Smoke
参考答案：B
