Piercing mill is the most important equipment on the rolling pipe line,and the frame is the nucleal component of the piercing mill.
穿孔是轧制钢管的重要设备,而是穿孔的核心分。
Piercing mill is the most important equipment on the rolling pipe line,and the frame is the nucleal component of the piercing mill.
穿孔是轧制钢管的重要设备,而是穿孔的核心分。
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