Drill pipes can be divided into three types: IU, EU and IEU.

石油钻杆可分为内加厚、外加厚和内外加厚三种类型。

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Drill pipes can be divided into three types: IU, EU and IEU.

石油钻杆可分为内加厚、外加厚和内外加厚三种类型。

youdao