unsaturated steam [化学] 不饱和蒸汽 ; 未饱和水蒸汽 ; 未饱和蒸汽 ; 未饱和的蒸汽
The most important route to produce these unsaturated hydrocarbons is by steam cracking, using principally petroleum gases or naphtha as feedstock.
生产这种不饱和烃类最重要的路线是靠蒸汽裂解，主要以石油气体和石脑油作原料。
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