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| section tube; profiled pipe; shaped pipe (【技】亦称经济断面钢管。它包括横断面轮廓非圆形的、变壁厚的、沿长度方向变直径和变壁厚的、断面对称的和不对称的等，例如方形、矩形、锥形、梯形、螺旋形管等。); shaped tube | |||
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