main haulage meaning in English
知运输
主要运输
主运输大巷
Examples
- The design of automatic air door in trackless main haulage roadway
无轨运输大巷的自动风门设计 - 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 - Reinforcement of bolt and grouting in main haulage roadway in linhuan coal mine
城郊煤矿煤巷锚杆支护参数及施工工艺