1·Ammonia is the feed stock to make nitrogen-based fertilizers.
氨是氮基，化肥的原料。
2·He said he was not currently using melamine. But he then pulled out a plastic bag containing what he said was melamine powder and said he could dye it any color to match the right feed stock.
他说，他目前也没有用到三聚氰胺。但随后他拿出一张一个塑料袋子，里面装的据说就是三聚氰胺粉，并说这种物质可以作为染料使得产品的颜色与饲料的原料一样。
3·The processes of feed stock modifying are introduced.
介绍了对原料进行改性的工艺。
4·The main properties of naphtha, diesel fuel fractions, catalytic cracking feed stock and residua from these crudes are also listed.
文中并列出了各种重质原油的汽油、柴油、催化裂化原料及渣油的主要性质。
5·The evaluation of catalytic pyrolysis catalyst using Daqing vacuum gas oil as feed stock was carried out on a heavy oil micro reactor.
采用重油微反应装置，以大庆蜡油为原料对催化裂解催化剂进行了反应评价。