The explosive range of a mixture of flammable vapors is specified as a percentage of （）.<br>A:flammable vapor by volume in air<br>B:oxygen present to support combustion<br>C:the temperature of the flash point<br>D:the lower limit of explosibility of the mixture

The explosive range of a mixture of flammable vapors is specified as a percentage of （）.
A:flammable vapor by volume in air
B:oxygen present to support combustion
C:the temperature of the flash point
D:the lower limit of explosibility of the mixture

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