The new products,new structures,new technicals and new development of drilling equipments,carryscrapers,trucks and auxiliary operation equipments in foreign underground mines are described.

 
  • 綜述了國外井下礦山鑿巖設備、鏟運機、汽車(chē)及輔助作業(yè)設備的新產(chǎn)品、新結構、新技術(shù)和新發(fā)展。
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国内精品美女A∨在线播放xuan