Keywords pre truncating crest room and pillar method;gently dipping middle thick ore body;rate of excavation and recovering;depletion rate;rate of wastage;

 
  • 预切顶房柱采矿法;缓倾斜中厚矿体;采掘比;贫化率;损失率;
今日热词
目录 附录 查词历史