The cutter of the coal mining machine bears dynamic load varying with time during excavating coal.

 
  • 采煤機截齒截割煤體時(shí),截齒承受隨時(shí)間而變化的動(dòng)載荷。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan