Vapor given off by a flammable liquid will burn when ignited provided（）<br>A:the vapor and air mixture is too rich<br>B:it is mixed with certain proportions of air<br>C:the vapor is too little compared to the air<br>D:it is of heavy toxicity

Vapor given off by a flammable liquid will burn when ignited provided（）
A:the vapor and air mixture is too rich
B:it is mixed with certain proportions of air
C:the vapor is too little compared to the air
D:it is of heavy toxicity

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