新鲜事
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If you want to improveyourself with respective to economic and contract model, it is better to takepart in some trainings and ..
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After deep thinking and some literature review, Isubmitted a strategic outline as the following points:Chapter One: SciTech D ..
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06:00-09:00 Directional drilling 6” drain hole by slid and rotary mode from 3977m to3980m. Drilling parameter: WOB: 3-6t, RP ..