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| 英汉对照参考资料(12) | |
| 作者姓名： | 林剑秋 |
| 摘 要： | The Future of Drilling EquipmentBut considering the 80 plus year history ofrotary oil well drilling, I confess to be just asmystified as he that so little has beenaccomplished in streamlining and improvingthe system.Why are rotary rigs, dnilling 5000 ft a |
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