opencast t mining plan露天矿矿图
opencast coal mining露天采煤
opencast t mining露天开采法;露天采矿
opencast coal-mining露天采煤
opencast mining equipment露天采矿设备
Opencast Mining Technology露天采矿技术;露天矿事故的成因和预防;安家岭露天矿排土场稳定性分析及工程治理;安全系统工程在露天煤矿生产中的应用
opencast mining plan[矿业] 露天矿矿图;露天矿矿图
opencast mining machinery露天采矿机械
opencast mining method露天开采法
N-UNCOUNT（不可数名词） Opencast mining is a method of mining that is used when a mineral is near the surface and underground passages are not needed. 露天采矿 [英国英语]