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NTN K 50×58×20轴承 SKF 53313 U轴承 SKF 71912 C/DB轴承 TIMKEN HM746646/HM746610轴承 INA HFL0822R轴承 KOYO NJ204+HJ204轴承 INA HK 1010轴承 INA K 45×53×20轴承 SKF 7318 BECBY 轴承 SKF 609-2Z轴承 SKF 2219K+H319轴承 NSK 6209N 轴承 TIMKEN 47898/47820轴承 NACHI 1308K+H308轴承 SKF 61917轴承 NACHI 6007-2RS轴承 KOYO NU 2217 E轴承 NSK 6208-2RS轴承 INA NAO30X47X16 轴承 NSK 30311轴承