鉆井司鉆講座
固井知識(shí)講座
方鉆桿規(guī)格
整體加重鉆桿規(guī)格
鉆桿規(guī)格介紹
鉆鋌規(guī)格介紹
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there be 相關(guān)句型
語(yǔ)法過關(guān)
Technicial English
01 English is a Cra...
English for the oil...
workover oral engli...
斯倫貝謝多礦物模型測(cè)井解釋基本原理(E...
English book 職稱外語(yǔ)
english of drilling
english