The paper studied the bottom structure of two classical two combination gas 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。
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 combination gas.
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。
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."
一名英国国家电力供应公司发言人说：“在使用已有的管道和新管道联合运输二氧化碳时，我们进行了专家评估。”
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