渣油加工有脱碳工艺 、 氢工艺及沥青气化工艺.Residue processing can be summarized as decarbonization, hydrogenation and asphalt gasification.含碳的铌合金,若在高温下受氧沾污,易产生脱碳现象.In niobium alloy containing carbon occurs decarburization in case of contami...
Care and diligence bring luck.谨慎和勤奋，带来好运气。Diligence combined with natural ability earned him commendations from superiors.勤奋加上天赋,使他受到了上司们的好评.Diligence redeems stupidity.勤能补拙。We should cultivate the good habits of diligen...