井下空气 meaning in Chinese
underground air
Examples
- The inspecting specification on safety technique for underground air compressors
煤矿井下空气压缩机安全技术检验规范 - Article 17 mining enterprises inspect the poisonous and harmful substances at the work sites and the percentage of oxygen in underground air to ensure that they meet safety requirements
第十七条矿山企业必须对作业场所中的有毒有害物质和井下空气含氧量进行检测，保证符合安全要求。