矿井运输 meaning in Chinese

mine haul

Optimized design of support parameter of main haulage roadway in jinjia mine
金佳矿井运输大巷支护参数的优化设计
Analysis and preventive measures of the demage reason for mine conveyance equipment
矿井运输设备电动机损坏原因分析及预防措施
Gather administrant wisdom and exalt transportation safe administrant level in coal mine
集中各专业管理智慧提升矿井运输安全管理水平