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SKF 36990/36920 轴承 NSK 71930 C/DF轴承 TIMKEN 639/632-B轴承 FAG 1210K轴承 NSK NF 317轴承 NSK NNU 49/560轴承 NACHI 61905-Z轴承 KOYO NJ314+HJ314轴承 SKF * 6314-2ZNR 轴承 IKO K 17×21×10轴承 KOYO 7310 AC/DF轴承 NTN 234730 B轴承 KOYO 23132 CCK/33+H 3132轴承 NACHI 2221K轴承 NTN NJ 208轴承 NSK N 220轴承 TIMKEN L420449/L420410轴承 NACHI NJ 236轴承 NSK 7324 B/DT轴承 NTN NU 2322轴承