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NTN NNU 4920 K轴承 NTN UK 211+H 2311轴承 KOYO 6312-2Z轴承 NTN NU 2222 E轴承 INA NKX50轴承 FAG 54414轴承 NTN K 80×88×30轴承 NSK 54412 U轴承 KOYO 7202 C/DF轴承 INA IR50X55X25轴承 NTN 32928轴承 NSK 6020-2Z轴承 NSK 33109轴承 NACHI 52414轴承 NACHI 7021 C轴承 SKF 7205 AC/DB轴承 KOYO 606轴承 SKF NCF 2944 CV轴承 NACHI 22234 CC/W33轴承 SKF 2207 E-2RS1TN9轴承