The properties of converse-spine nut joint, dowel joint and tenon joint were separately and studied through experiment.

 
  • 通過(guò)試驗,對金屬倒刺螺母螺桿連接件接合與直角榫接合及木螺釘接合性能進(jìn)行了比較和研究。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan