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本襯墊適用于入孔,出孔的焊接使用.This welding backing is specially designed for hand holes and manholes welding.由于有個可以呼吸通常的出孔, 我的眼睛不會起霧.With the breathing out vent, they don't fog up my eyeglasses.子彈在他的左肺上面穿出孔來.The bullet perforate...