The research results show that the conveyer belt and the double horse-head pumping unit will save more energy than the ordinary beam pimping unit tinder the same loading.

 
  • 結果表明,在負載相當的情況下,皮帶機和雙驢頭機比普通游梁抽油機節能;
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan