查询词典 tar

It was discovered in the late nineteenth century as a derivative of toluene (a solvent derived from coal tar).

它是于十九世纪后期作为甲苯（一种煤焦油的可溶的衍生物）的一种衍生物被人发现的。

The separation and purification processes of 2,6-DMN from coal and petroleum tar are reviewed.

文摘：本文介绍了2，6-二甲基萘的用途和制备方法；综述了从煤焦油和石油中分离提纯2，6-二甲基萘工艺。

A kind of self-made coal tar cleaning agent and its specialty were introduced.

介绍了一种自制焦油清洗剂及其特性，并重点介绍了其在某炼焦煤气厂的实际应用。

Under the oxidative atmosphere, the most of sulfur in coal is transferred into tar.

在氧化性气氛下，脱除的硫主要分布在焦油中；随着氧气体积分数的提高，半焦收率下降的很快，下降幅度要比脱硫率的增加幅度大。

Two methods of distillation crystallization method and gas chromatography to determine the naphthalene content in coal tar oil were introduced.

介绍煤焦油中萘含量测定的两种方法：蒸馏结晶法和气相色谱法，对两种方法的优缺点及分析结果进行了对比。

Ammonia, coal tar and coke are all by-products obtained in the manufacture of coal gas.

氨气、煤焦油、焦煤都是煤气生产过程中的副产品。

For the high nitrogen mass fraction in coal tar,the hydrodenit...

由于煤焦油的氮含量较高，要达到较好的加氢脱氮效果必须在高温、高压和低空速下进行。

Hejin City is the country's largest high-quality coal tar origin.

河津市是全国最大的优质煤焦油产地。

The 600,000-ton annual capacity coke-oven and the complementary gas and coal tar processing installations of No.1 cokery of this company were set up in 1979 and have a history of more than 20 years.

公司第一焦化厂年产60万吨焦炉及配套的煤气、焦油加工装置始建于1979年，已有二十多年的历史。

Then a complex fraction of coal tar anthracene oil was analysed under the same condition, which showed the application potentialities of this multidimensional chroma...

采用正相HPLC－GC联用结合反冲技术，分离了重质石油中的饱和烃、芳烃和极性化合物。

I can do simple painting, carpentry and plumbing.

我能做简单的油漆、木工和修水管等工作。

The motivations, notations and outline of this work are also given in this chapter.

从这个意义上讲，这些时滞是无害的。然后用实例说明这三个定理的应用和互不包含性。