The ignition and steady combustion of fuel and combustion condition are the key factors to the combustion stability of boiler, so they determine the security and economy of boiler.
燃料的着火及稳定燃烧与燃烧环境是影响锅炉燃烧稳定性的最主要因素，对锅炉的安全经济运行有着重要影响。
The choice of precursor, avoiding impurity phases and the condition of selenization are the key factors of low cost processing.
前驱物的选择，杂相的去除，以及后处理条件是影响非真空工艺的关键因素。
Both the condition of the heat, the moisture of the subgrade, their changing law and the stress distributing are the key factors to cause the frost damages.
路基的热状况、水分状况与变化规律及由此引起的应力重分布是引起道路冻害的主要因素。
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