1·This has made it much easier and cheaper to extract gas from shale, coal and other less permeable geological formations (which yield so-called “tight gas”).
通过这种方法，从叶岩、煤炭以及其他渗透性差的地质构造中提取的天然气，更容易也更便宜。
2·Oil, gas, coal and timber companies, by contrast, all have to pay substantial royalties, of up to 12.5% of gross income, when they extract from federal lands.
相比之下，汽油，天然气，煤炭和木材公司在从联邦土地上进行开发工作时，都需要支付高达总收入的12.5%的特许使用费。
3·In view of complex and changeable background noise in coal mines exploitation, the key question is how to extract the effective AE signal.
鉴于煤矿开采过程中，背景噪声相当复杂且多变，如何能将有效的AE信号提取出来是一个关键问题。
4·The way of extract iron from iron briquette by coal under high temperature has studied.
本文研究内配煤铁矿团块在高温下快速自还原直接得到金属铁颗粒的方法。
5·After the coal is ground into a powder, a weak mineral acid is added to extract stabilizing additives from the coal.
在将煤研磨成粉末后，加入弱无机酸，以从煤中萃取稳定性添加剂。
6·High organosulfur coal (HOSC) is very special in that it is rich in sulfur containing compounds (SCC) in aromatic fraction of extract.
高有机硫煤是一种十分特殊的煤种，其特点之一是抽提物芳烃馏分中含丰富的含硫化合物。
7·Through the summarization for semi-water coal gas tannin extract de-sulfur reformation in Zhisheng Chemical Engineering Company Ltd.
通过对智胜化工有限公司半水煤气栲胶脱硫改造的总结，从设备改造、工艺控制等方面简述了脱硫技改的措施和效果。
8·The study results indicated that the ability of Soxhlet extraction method to extract PAHs from raw coal is be...
结果表明，在本实验条件下索氏提取法在提取原煤中多环芳烃能力上优于超声提取法。