复合管柱的英文

• graduated string

• 复合:    compound; complex; composite ...
• 管柱:    tubular column
• 混合管柱:    combination string; mixed column
• 组合管柱:    combined string
• 复合管:    bimetal tube; clad pipe; complex pipe; composit pope; composite pipe，compound pipe; composite tube; composited tube; duplex tube; multiple unit tube; multiple-unit tube; multiunit tube; multiunit tubo; psp