单选题

This is the minimum concentration of flammable vapors in air below which propagation of flame does not occur on contact with a source of ignition.

A This is the maximum portion of flammable vapors in air If the portion is bigger, when an ignition source touched the gas, it would cause the fire to be diffused.

B This is the minimum volume of flammable vapors. If the volume is lower, when the gas contacted with an ignition source, the fire would not come out.

C This is the minimum density of flammable vapors in air, if the density was lower, when an ignition source touched the gas, it would not cause the spread of flame.

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正确答案：A （备注：此答案有误）

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This is the minimum concentration of flammable vapors in air below which propagation of flame does not occur on contact with a source of ignition.

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