operation line的用法和樣例：
例句
- A new method is proposed for analysis of oxygen-enrichment and pulverized coal injection using Rist operating line,which will be helpful to improve the injection operation.
首先提出了一種適宜于分析富氧噴煤工藝的高溫區熱平衡計算法，然后又將其引入到操作線(xiàn)中，最后結合實(shí)例運用操作線(xiàn)分析了富氧噴煤后焦比的變化及其置換比。
