指邮政日戳、邮政夹钳和邮袋。
special postal articles: referring to postal date-marks, postal tongs for lead sealing and postal bags.邮政专用品:指邮政日戳、邮政夹钳和邮袋。
In the lack of condition for the pressure test, it is not allowed to remove the lead sealing of the reversing valve to adjust the pressure regulating button.在不具备压力试验条件时,不允许拆掉换向阀的铅封和调整调压弹簧座。