Methane and propane are alkanes.

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.

Usage: 1. Using as high efficiency inhibitor for vinyl monomer and conjugate alkene.

用途: 1. 作为乙烯基单体及共轭烯烃的高效阻聚剂.

Synthesis of soluble fluorinated alkene with hydroxyl and preparation of fluorinated polyurethane coatings were described.

本文介绍了可溶性的带羟基含氟烯烃的合成及含氟聚氨酯涂料的制备.

The betaine will collapse to the alkene only when these two functions are eclipsed.

只有当这两个基团移至重迭位置时碘盐才能裂解为烯烃.

A hydrocarbon was known to be either an alkene or alkane.

某碳氢化合物已知可能是烯烃或是烷烃.

The hydrocarbon must be an alkene.

这个碳氢化合物必定是烯烃.

Many constituents are mutagens and carcinogenic such as alkenes, nitrosamines, polynuclear aromatic and heterocyclic hydrocarbons, amines.

烟草的很多成分都会引起有机体突变以及致癌,如烯烃化合物, 亚硝胺, 多核芳香烃以及多环碳氢化合物和铵.

The rate constants of radical and electrophilic addition to alkenes are dominated by different factors.

烯烃的自由基加成和亲电加成速率受不同的因素控制.

Epoxidation of alkenes is one of the most important reactions in organic, synthesis.

烯烃环氧化在有机合成中占有十分重要的地位.

The invention relates to a work-starting method of FCC gasoline hydrodesulfurization to degrade the alkenes.

本发明涉及一种FCC汽油加氢脱硫降烯烃技术的开工方法.

Oil & oil products and alkanes, alkenes & polymers.

石油 、 石油产品、烷烃 、 烯烃 以及 聚合物.

Therefore, the market for alkenes products is broad with immense economic potential.

烯烃类产品市场广阁,经济效益潜力巨大, 因此该项目的市场前景非常看好.

Recent progress on asymmetric epoxidation of alkenes by chiral catalysts was summaries.

综述了手性催化剂催化的不对称环氧化反应研究进展情况.