短语词组短語seal catch ring 密封擋環Seal Shim Ring 閥蓋環C seal -ring C形密封圈seal retaining ring 密封固定環seal case ring 密封箱圈seal protector ring 密封防護墊環seal wiper ring 封閉刮油環INTERNAL SEAL -RING 內部密封環seal packing ring o 形密封圈 返回 seal ring