If an acetylene cylinder receives a sharp or deep dent, the metal is gouged, or any other mechanical defect, circle the defect with a marking pen to alert the supplier of the defect.

• 如果乙炔钢瓶有尖锐或深的凹陷，金属被凿，或任何其它机械缺陷，用记号笔在缺陷处画个圆来警告供应商。