常見例句雙語例句This paper work out a better applied technique of steel normal-temperature quick nigrescence via discussing various factors' influence on the speed of nigrescence and the capability of plating.本文討論了諸多因素對黑化速度及黑化膜性能的影響，確定較好的常溫快速化學發(fā)黑實用技術(shù)。 返回 nigrescence