• Based on introducing the working principles of the metal bar code, a method to manage drill string by planting metal bar code into the connection was developed.

    结合柳湾煤矿开拓巷道 ,顺槽和综采工作面切割巷 ,采用锚网支护试验对金属作用机理进行重点研究。

    youdao

  • Main products include ductile manhole covers, composite resin covers, drill rod cement covers, galvanized steel grating, polymer alloy covers, cast iron manhole covers, flower bar, cast iron pipe.

    主营产品球墨井盖复合树脂井盖钢钎水泥井盖、镀锌格板合金高分子井盖、球墨铸铁井盖、铸铁井盖、、铸铁管等

    youdao

  • Main products include ductile manhole covers, composite resin covers, drill rod cement covers, galvanized steel grating, polymer alloy covers, cast iron manhole covers, flower bar, cast iron pipe.

    主营产品球墨井盖复合树脂井盖钢钎水泥井盖、镀锌格板合金高分子井盖、球墨铸铁井盖、铸铁井盖、、铸铁管等

    youdao

$firstVoiceSent
- 来自原声例句
小调查
请问您想要如何调整此模块?

感谢您的反馈,我们会尽快进行适当修改!
进来说说原因吧 确定
小调查
请问您想要如何调整此模块?

感谢您的反馈,我们会尽快进行适当修改!
进来说说原因吧 确定