Besides heat, fuel, and oxygen, which of the following is necessary for a fire to exist?（）<br>A:Chain reaction<br>B:Thermal action<br>C:Chemical occlusion<br>D:Pyrotechnical reaction

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

出自：海船船员证

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