At last, some suggestions were raised for the concrete backfill mining.最后对具体的充填开采方法提出了建议.This article is good for promotion of backfill.本文对充填技术的推广,具有一定的参考价值.The upward drift stoping with backfill is a mining method with ...
At last, some suggestions were raised for the concrete backfill mining.最后对具体的充填开采方法提出了建议.This article is good for promotion of backfill.本文对充填技术的推广,具有一定的参考价值.The upward drift stoping with backfill is a mining method with ...
The jet-setting couple made frequent appearances in the gossip columns.这对穿梭于各国的富豪夫妇经常出现在八卦专栏。Tramp, tramp , tramp , columns of militiamen marched by in perfect step.一队队民兵欻欻地走过去,非常整齐.The dome was supported by white marble...