[机]?夏用黑机油

... sulphonitrocarburizing gas 气体硫氮碳共渗剂 summer black oil 夏用黑机油 summer compound oil 夏季用齿轮油 ...

?回火油

... 特质淬火油(临界冷却速度快的) superquench oil 回火油 steam-hammer oil; summer black oil; tempering oil 火油炉 oil burner ...