The wide flammability range, 4% to 74% in air, and the small amount of energy required for ignition necessitate special handling to prevent the inadvertent mixing of hydrogen with air.
在空气中氢的易燃范围很宽，从4%到74%，而且点燃所需的能量很少，必须特别处理，以防止无意中把氢和空气混合在一起。
Analyzed the coal dust samples we collected, mensurated the minimum ignition temperature of coal dust layer and coal dust cloud in different diameter range.
对所采集煤尘样品进行实验分析，测定了不同粒径范围下煤尘层和煤尘云的最低着火温度。
Results show that the rocket ignition time has little effect on uncontrolled trajectory and the dispersion of the starting position of guidance in the range of the rocket ignition time.
结果表明，在发动机点火时间范围内，点火时间对无控弹道射程和惯性制导启控点散布影响不大。
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