Piercing mill is the most important equipment on the rolling pipe line,and the frame is the nucleal component of the piercing mill.
穿孔是管的重要设备,而架又是穿孔的核心组成部。
Piercing mill is the most important equipment on the rolling pipe line,and the frame is the nucleal component of the piercing mill.
穿孔是管的重要设备,而架又是穿孔的核心组成部。
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