常見例句雙語例句In this paper, its history was introduced. The functional elements and their action mechanisms of ashy and ashless additives were analyzed.文章簡要介紹了消煙助燃劑的發(fā)展史，對有灰型與無灰型消煙助燃劑的功能單元及作用機(jī)理進(jìn)行分析。 返回 ashless paper