The most important route to produce these unsaturated hydrocarbons is by steamcracking, 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。
2
This paper illustrates the allowance and hazard of the main impurities in cracking feedstock and diluting steam, and provides specific control methods.
文中列举了裂解原料与稀释蒸汽中主要杂质的允许值及其危害，并给出了具体的控制手段。
3
The reasons and regularity of pipe stress corrosion cracking of some nuclear-powered steam generator was summarized, which caused serious leaking accident.