... height variation factor of wind pressure 风压高度变化系数 helical weld 螺旋形焊缝 high-strength bolt 高强度螺栓 ...
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helical weld pipe 螺旋焊管
helical-weld pipe 螺旋焊管
helical weld tube [机] 螺旋焊管
helical-weld tubes 螺旋焊管
helical-weld pipe forming mill 螺旋焊管成型机
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