短語詞組短語reverse lever fulcrum pin 回動桿支銷valve lever fulcrum shaft 閥桿支架軸dead lever fulcrum bracket 固定杠桿支點托架dead lever fulcrum 固定杠桿支點Grate lever fulcrum [鐵路]搖爐杠座control lever fulcrum 控制桿支點brake lever fulcrum 制動杠桿支點dead lever fulcrum bracket location 固定杠桿支點安裝面floating lever fulcrum connecting rod 游動杠桿支點連桿 返回 lever fulcrum