1193、This is the minimum concentration of flammable vapors in air below which propagation of flame does not occur oncontact with a source of ignition.

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

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

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

答案解析

正确答案：A

解析：

解析:注释: maximum 和 minimum 互为反义词。concentration=density 浓度;portion 部分; volume 体积,容积。below=lower 下面,低于;bigger 较大。

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