The technology of developing quality and strong pick is found by researching the hard metal alloy, pick-body material, weld gap, technique of braze welding and heat treatment.

　
英 美
  • 通過(guò)對硬質(zhì)合金、截齒體材質(zhì)、焊縫間隙、釬焊及熱處理工藝的研究,尋找出了研制優(yōu)質(zhì)強力截齒的技術(shù)途徑。
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目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan