Piercing mill is the most important equipment on the rolling pipe line,and the frame is the nucleal component of the piercing mill.
穿孔机是管的重要设备,而机架又是穿孔机的核心组。
Piercing mill is the most important equipment on the rolling pipe line,and the frame is the nucleal component of the piercing mill.
穿孔机是管的重要设备,而机架又是穿孔机的核心组。
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