pllar
英
美
【医】毛发的
双语例句
- In light of the rock stratum displacement problem of underground metal mines and with China's mines that use non pllar sublevel caving mining as example, the investigation and analysis of rock stratum displacement law were made.
针对地下金属矿山的岩层移动问题，以国内无底柱分段崩落法矿山为例，进行岩层移动规律调查分析。