Colour stability of coker gas oil has been improved by DMF extraction.以二甲基亚砜为萃取溶剂,用溶剂萃取的方法提高焦化柴油的颜色安定性.The coker gas oil was refined by benzyl alcohol extraction.以苄醇为溶剂,用萃取方法提高了焦化柴油的质量.Tell Colonel Coker, I am investigat...
Such cuestas may be either erosional escarpments or fault scarps.这类单面山既可以是侵蚀山崖也可以是断层崖.The escarpments are sustained by rock.这些垅岗由岩石构成.Danxia landform is the continental red bed landform with escarpments.丹霞地貌是指有陡崖的陆相红层地貌....