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1. V-shaped sealing ring is a kind of elastic rubber sealing ring acting axially, used as a pressureless seal of the rot···
① For oil seals used in hydraulic pumps and motor journals, not only the roughness of the sliding surface is requir···
The oil seal is also known as the oil protection ring. It is irreplaceable in the rotating pa···
At present, all major brands of earphones or better-quality earphones are using silicone earmuffs. S···
