The draft of coal mine excavation plan is typically an unhealthy structural and complex tech economic problem.
矿井采掘计划的编制是典型的不良结构和复杂的技术经济问题。
They pointed out that the excavation of fossil fuels has its own history of catastrophic accidents, including coal mine collapses and the recent BP oil spill in the Gulf of Mexico.
他们指出化石燃料的挖掘也有导致灾难性事故的历史，包括煤矿垮塌和最近英国石油在墨西哥湾的漏油事件。
In view of the mine actual situation of coal resource approaching exhausted, natural coke excavation craft was studied.
针对矿井剩余煤炭储量接近枯竭的实际情况，进行了天然焦开采工艺研究。
应用推荐