Aluminium and aluminium alloys. cold drawn rod bar and tube. part 8 : porthole tubes, tolerances on dimensions and form.
铝及铝合金。冷拔棒材条材和管材。第8部分：多孔拉拔管尺寸和形状公差。
A variety of hot-rolled bar, cold drawn bar and a variety of year-round agency specifications of the bar.
各种规格热轧圆钢，冷拉圆钢及常年所代理公司的各种规格圆钢。
A variety of hot-rolled bar, cold drawn bar and a variety of year-round agency specifications of the bar.
各种规格热轧圆钢，冷拉圆钢及常年所代理公司的各种规格圆钢。
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