单选题Vapor given off by a flammable liquid will burn when ignited provided（）Athe vapor and air mixture is too richBit is mixed with certain proportions of airCthe vapor is too little compared to the airDit is of heavy toxicity
单选题
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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