pretightening

英[prɪ'taɪtnɪŋ] 美[prɪ'taɪtnɪŋ]
  • 预紧
  • breakdown n.崩溃;故障;衰弱;分类,明细;跺脚曳步舞
  • pre abbr.PetroleumRefiningEngineer炼油工程师