optimizing olevels in fired heaters使: send; tell sb. to do sth.火焰: flame; blaze加热器: calorifier; stove; heat boos ...中: hit; fit exactly氧气: oxygen; oxygen gas下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:使火焰加热器中氧气水平最优化，即可在微信中查询翻译
