大片的森林和草原都处于干旱状态给自然火灾带来了大量的燃料，相对较高的阵风天气和低湿度则给火灾快速蔓延提供了绝好机会。
Relatively high winds and low humidity levels have also contributed to the rapid spread and expansion of fires.
当输出负载变化时，如何采取适当的控制策略控制加湿器出口气体的湿度是燃料电池技术中的一个难题。
One of the problems of fuel cell technology is how to control the humidity of the outlet gases of the humidifier.
研究了燃料种类、热风炉的排烟温度、过量空气系数以及燃烧空气湿度和温度对排烟热损失的影响规律。
Studies the fuel kinds, the exit gas temperature of the hot air furnace, the excess air coefficient and the air moisture and temperature 'influence for waste heat loss.
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