短语词组短语helix steel tube 螺旋钢管vertical helix fire tube 立式螺旋火管vertical helix trough tube 竖直螺旋槽管Helix inner tube 螺旋内管helix finned tube bundle 螺旋翅片管束helix flash tube 螺旋形闪光灯helix Bourdon tube 螺旋弹簧管 返回 helix tube