For example, at deep South African gold mines, up to 67 percent of the fatalities and 30 percent of the injuriesare due to rock-related accidents.

 
  • 在南非的深部金矿,67%25的死亡和30%25的受伤者与岩爆和岩崩有关。
今日热词
目录 附录 查词历史