DZ-1 small -sized directional drilling newly developed by China Petroleum pipeline Scientific Research Institute provides an advanced method for laying of various pipelines.
由中国石油天然气管道科学研究院最新研制的DZ - 1小型定向钻为各类地下管道的敷设提供了一种先进的方法。
DZ-1 small -sized directional drilling newly developed by China Petroleum pipeline Scientific Research Institute provides an advanced method for laying of various pipelines.
由中国石油天然气管道科学研究院最新研制的DZ - 1小型定向钻为各类地下管道的敷设提供了一种先进的方法。
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