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1·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。

2·English Name:Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 8: Porthole tubes, tolerances on dimensions and form;

简体中文标题：铝和铝合金。挤压棒材、管材和型材。第8部分：带孔管材。尺寸和形状公差。

3·The ageing-stress relaxation sizing and forming processes have been successfully used to form complex skin panels to typical aircraft tolerances with many advantages compared to other methods.

时效应力松弛校形和成形方法已成功地用于制造飞机铝合金蒙皮壁板，具有很多优点。

4·Mechanical dial comparator is designed for measuring and cheching the workpieces in respects of their geometric accuracy and form-location tolerances;

杠杆齿轮比较仪适用于测量工件的几何尺寸和形位差。