The paper studied the bottom structure of two classical two combinationgas lift systems and compared the merits & demerits of them.
本文分析了两种典型的组合举升系统井下结构及其优缺点。
2
From the drill holes, it is found that most area of the county belongs to Tertiary system stratum of integrity, which is the perspective stratum of containing combinationgas.
本县境内大部分地区钻孔内部钻遇比较完整的第三系地层，是含油气的远景层区。
3
A spokesman for National Grid said: "We provide the expertise in the transportation of carbon dioxide gas through a combination of new and existing pipelines."