单选题Besides heat, fuel, and oxygen, which of the following is necessary for a fire to exist?（）AChain reactionBThermal actionCChemical occlusionDPyrotechnical reaction
单选题
Besides heat, fuel, and oxygen, which of the following is necessary for a fire to exist?（）
A
Chain reaction
B
Thermal action
C
Chemical occlusion
D
Pyrotechnical reaction
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