The amount of gas used means that a barrel of Californian heavy oil gives the stuff from Canada's tar sands a run for its money in terms of associated greenhouse-gas emissions.
根据相关的温室气体排放,天然气的耗费量意味着每桶加州重油竭尽全力从加拿大沥青砂岩中提取材料。
These spalls occur in work rolls with flake graphite iron core used in highly loaded 4-hi hot mill stands and are predominantly located in the centre of the barrel.
这种剥落往往发生在片状石墨芯部的离心工作辊(4辊轧机),而且发生的部位往往是辊身中部。
The core drilling method and the obtained achievement are introduced with respect to the bit and core barrel used in different formation.
根据不同地层所采用的钻头和取心器,介绍了不同地层的钻进取心方法和取得的成果。
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