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...
have much ado费尽心血，费尽力气My sister always makes much ado about nothing.我的妹妹老是无事自扰.So, without more ado, let me introduce tonight's guests.所以, 我就不再啰嗦了, 还是介绍一下今晚的客人吧.I had much ado to forebear laughing.我费了很大的劲才忍住笑.So,wit...