单选题The explosive range of a mixture of flammable vapors is specified as a percentage of （）.Aflammable vapor by volume in airBoxygen present to support combustionCthe temperature of the flash pointDthe lower limit of explosibility of the mixture
单选题
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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