Advances in tungsten carbide alkanes isomerization catalysts, including their preparation and the isomerization mechanism, were reviewed.

A method for analysis n-alkanes, steranes and terpanes in oil by internal standard method was established.

采用内标法建立了原油中正构烷烃、生物标志物(甾 、 萜烷类)的分析方法.

The properties and commercial application of LIP FCC catalyst for more iso-alkanes were described.

介绍了LIP系列多产异构烷烃催化剂的性能及工业应用情况.

The alkanes are non-polar.

烷 是非 极性的.

Other components are the homologous alkanes, ethane, propane, and higher hydrocarbons.

其他组分有同系烷 、 乙烷 、 丙烷和高分子碳氢化合物.

Other components are the homologous alkanes, ethane, propane, higher hydrocarbons.

其他组分有同系烷 、 乙烷 、 丙烷以及高分子碳氢化合物.

This fact shows that MTBE and ethanol retard the oxidation of alkanes.

这表明,在燃烧的起始阶段,MTBE、乙醇有抑制烷烃燃烧的作用.

The gradation in the physical properties of the alkanes is typical of a homologous series.

烷烃物理性质的逐渐变化是同系列的特点.

The alkanes are generally inert to ionic reagents.

烷烃一般说来对离子型试剂是不活泼的.

Alkanes are resistant to attack by oxidizing agents generally.

烷烃一般对于氧化剂的作用是稳定的.

The straight-chain alkanes exacerbate the problem of engine " knock ".

直链烷烃使机器的 “ 爆震 ” 问题更加严重.

The general uses of alkanes may be divided into three categories.

烷的一般用途可分为三个方面.

Methane and propane are alkanes.

甲烷和丙烷是烷烃。

Thoracic myelopathy in a patient with alkaptonuria has not been previously reported.

之前尚无尿黑酸尿病人合并胸椎脊髓病的报道.

The results showed that there were abundant inorganic elements in physalis alkekengi L . var.

结果表明,锦灯笼含有丰富的对人体有益的无机元素,具较高的营养价值.

Objective : To establish method for determining the content of physalis alkekengi L.

目的: 建立锦灯笼宿萼的含量测定.

The preparation of sodium malonyloxyborohydride in situ and its selective hydroboration alkene are described.

叙述了丙二酰氧基硼氢化钠的制备及其原位与烯烃的选择性硼氢化反应.

Tungstogermanic acid as a catalyst for dehydration of alcohol to form ether or alkene is reported.

报道了钨锗酸对醇脱水成醚或成烯的催化反应.

This paper reviewed the researches of alkene on physiological efficacy, construction and its formation mechanism.

本文综述了近年来有关阿霍烯的生理功效, 结构组成及形成机制等的研究概况.

The preparation of potassium malonyloxyborohydride in situ and its selective hydroboration alkene are described.

介绍了丙二酰氧基硼氢化钾的制备及其原位与烯烃的选择性硼氢化.

Pyrolysis gasoline contents high alkene, so it can not be sold as commercial gasoline.

裂解汽油烯烃含量高, 不能作为商品汽油销售.