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| 1. | explosive limit of flammable gas |
| 可燃气体的爆炸限 |
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| 2. | lower explosive limit |
| 低爆炸限制 |
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| 3. | UEL (upper explosive limit) |
| 爆炸上限 |
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| 4. | of less than 13% by volume, or has a flammable range in air wider than 12%, regardless of the lower explosive |
| DOT对易燃气体的定义是：在体积浓度小于13%的情况下同空气形成易燃混合物的任何压缩气体，或者不考虑较低的爆炸极限（LEL），在空气中的易燃范围大于12%的任何压缩气体。 |
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