1B) Steel parts must have polished angles and their visible surfaces smoothed down. Screw heads have to be polished, with their slots and rims chamfered.
1B) Steel parts must have polished angles and their visible surfaces smoothed down. Screw heads have to be polished, with their slots and rims chamfered.
所有钢制零件的边缘必须削角、打磨、抛光使其如镜面般光亮。所有螺丝帽的边缘及凹口都要削角抛光，螺丝尾则须做平面或球面抛光。