The surrounding rock of roadways in soft coal seam has low strength and bad stability.

This paper is a guide to precise determination of the content of coal seam methane.

对正确测定煤层瓦斯含量有一定的指导意义.

This paper goes further into blast-winning technology of the composite coal seam face.

深入探讨了复合煤层回采工作面“松动放炮”落煤的工艺问题.

There are of forms of gas discharge , but the form is soft coal seam gas discharge.

目前在瓦斯抽放中急待解决的问题是软煤层瓦斯抽放的打钻技术,尤其是深孔打钻技术.

On a global scale, there are many coalfields suffered from spontaneous combustion of coal seam problems.

在全球范围内, 许多煤田都存在煤层自燃问题.

Coal Mine and the coal seam 13-1 has especially complex hydrogeology condition.

新集二矿在特定推覆体水体下的煤层开采, 13-1 煤开采水文地质条件尤为复杂.

The spontaneous combustion of coal seam endangers the safe production.

井下煤层自燃严重危害着安全生产.

The Gaussian curvature of No.3 coal seam in Qinshui basin is calculated.

计算了沁水盆地3号煤层的高斯曲率.

Factors affected coal seam permeability change and its law is analyzed.

分析了煤层透气性变化的影响因素及变化规律.

Coal Mine, its coal seam is easily spontaneous fire.

大雁二矿煤种为褐煤, 属易自燃发火煤层.

The average UK coal seam is one metre thick.

英国煤层的平均厚度为1米。

They will report on the experiments with coal tar.

他们将汇报煤焦油的试验情况.

The structure change of medium coal tar pitch ( MCTP ) during co-carbonization was investigated by using NMR.

使用一种工业重质油和中温煤焦油沥青进行共 炭化 反应,改善了煤沥青的炭化性质.

Rich as it is in China, coal tar has not been effectively and rationally utilized.

我国煤焦油资源丰富, 但尚未得到有效和合理利用.

Our main products are coke, coal tar, coal gangue, crude benzene, gas, such as metallurgical coke.

公司主要产品为焦炭 、 煤焦油 、 煤矸石 、 粗苯 、 煤气 、 冶金焦等.

From something as vile as coal tar came a remarkably versatile substance.

从某种像煤渣那样污秽的东西中炼出了一种用途十分广泛的东西.

A colorless organic liquid, C 9 H 8 , obtained from coal tar and used in preparing synthetic resins.

'茚'.''一种无色的有机液体, c9h8, 从煤油中取得并用于配制人工合成树脂.

Several graphite samples were made from calcined coke and coal tar by hot pressing.

用煅烧石油焦和煤焦油为基本原料,采用热压工艺制备了几种石墨材料.

Methods of modified coal tar pitch for preparing high specific surface area activated carbon were studied.

研究了用于制备高比表面积活性炭的改质煤沥青的调制方法.

Coal tar has a strong smell and can stain clothing.

煤焦油有很强烈的气味,并且会染污衣服.

The behavior of pyrolysis condensation of coal-tar pitch during the thermal polymerization modification is described.

简要介绍改质沥青在炭素制品生产中的重要作用以及生产改质沥青的二种工艺.