方法：采用理论分析的方法，对各种指标的含义、应用方法进行具体分析。
METHODS: the significance and the application of each kind of index system were analyzed theoretically.
采用理论分析的方法，对水平巷道火灾时期的烟气逆流现象进行了深入研究。
Deep study was made on reverse smoke flow during fire in the entry by theoretical analysis method.
方法理论研究：采用文献搜集、整理、分析、论证和总结的方法。
Methods: Theoretical research: With document, collect and arrange, the method of analysis, demonstration and summary.
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