老坑

老坑老坑
  1. 祖母绿色顶级老坑玻璃种翡翠在标准光源D65光源和A光源下显色都能达到极致。

    High-grade jadeite jades should use light source A , because it can enhance the color green .

  2. 金川露天矿东部老坑采场边坡的安全评价

    Safety evaluation of old Eastern pit slope in Jinchuan open pit mine

  3. 他们重新开挖了老中国坑的矿坑。

    They reopened a mine , the old China pit .

  4. 本文总结了湘西金矿老矿山闭坑中充分回收残矿柱资源的实践经验。

    Practical experience of residual pillar resources recovery during old workings close period in Xiangxi Gold Mine was summed up in this paper .