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| The upper explosive limit (UEL) of a mixture of flammable vapors and air is defined as __________. |
| A) that concentration above which there is just enough flammable vapor to produce an explosion |
| B) that concentration above which the mixture is too rich to burn |
| C) the percentage of flammable vapor by volume in air sufficient to create an explosion |
| D) the percentage of oxygen present in the air sufficient to support combustion |
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