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异型管材
met.
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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