短語(yǔ)詞組短語(yǔ)backup p ring 墊圈Plunger backup ring 陶瓷桿後的銅墊PACKING BACKUP RING 包裝備份環(huán)harden stainless steel backup ring 不鏽鋼環(huán)Ring -backup 環(huán)形備份 返回 backup ring