您要查找的是不是：
- The structure and composition of petroleum acids isolated from Gudao crude oil were investigated by means of IR and GC/MS. 采用红外、色质联用等分析手段对孤岛原油中羧酸的分布、结构及组成进行了研究。
- The structure and composition of petroleum acids isolated from Gudao crude oil were investigated by means of IR and CC/MS. 摘要采用红外、色质联用等分析手段时孤岛原油中羧酸的分布、结构及组成进行了研究。
- The raw materials and process in synthesizing petroleum sulfonates and the fine composition of petroleum sulfonatesare introduced. 介绍了合成石油磺酸盐的原料和工艺以及石油磺酸盐的精细结构。
- The thesis analyses in depth form foundation of price of petroleum forms, Science defines petroleum production cost, composition of monopoly profits and land rent. 论文深入分析了石油价格形成的基础，科学界定了石油生产成本、垄断利润、地租的内涵和构成。 论文指出石油价格中包含的垄断利润是石油垄断组织凭借其垄断地位获取的超过平均利润的超额垄断利润；
- According to the structural group theory, the chemical composition of petroleum fractions can be classified as structural groups as aromatics, naphthene, olefin and non-hydrocarbon elements etc. 按照结构基团理论，将石油馏分的化学组成划分为芳烃、环烷烃、烯烃和非烃元素等结构基因，其中芳烃和环烷烃还按照其环分布划分为若干个亚族基因。
- A trademark used for a brand of petroleum jelly. 凡士林用来作为石油脂的商标
- The chemistry of petroleum and its derivatives. 石油化学石油及其复合物的化学
- The composition of the report took two months. 写这份报告花了两个月时间。
- fractional composition of petroleum 石油馏分组成
- The apparatus used in the cracking of petroleum. 裂化设备用于裂化石油的装置
- After chemical assay, we have known the composition of the ore. 经过化学分析，我们知道了矿石的构成。
- Place a dab of petroleum jelly on the bulb. 涂少量的凡士林在温度计上。
- Any new source of energy will be welcome, as there is a shortage of petroleum. 由于石油短缺，任何一种新能源都会受欢迎。
- Kerosene is a by-product of petroleum refining. 煤油是提炼石油的副产品。
- Fertilizers modify the composition of herbage. 肥料可改变牧草的组成。
- The prices of petroleum products have soared. 石油产品价格已上升。
- Tin enters into the composition of pewter. 锡是白的成分之一。
- They'll sink a well in search of petroleum. 他们将钻井找石油。
- B:All plastics are the byproducts of petroleum. 所有塑胶都是石油的副产品。
- The changing composition of the electorate. 有改变的选举团组织
