It is of great significance for some of the mines using model LK-1 LHDs in our country to reduce their level of pollution.
改造LK——1型铲运机，以降低其污染水平，对我国某些使用这种设备的矿山具有重要的意义。
2
This report is concerning the operation performance, productivity, operating cost, existing problems and proposals for improvements of underground iron mine LHDs in China.