英汉对照参考资料(12)

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

Abstract:

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