• Briefly described in the article are the structure of the three - roll piercing mill and troubles and failures frequently occurring in the operation thereof.

    简介穿孔机结构以及生产过程中的常见故障事故

    youdao

  • Briefly described in the article are the structure of the three - roll piercing mill and troubles and failures frequently occurring in the operation thereof.

    简介穿孔机结构以及生产过程中的常见故障事故

    youdao

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