单项选择题
A.深沟球轴承 B.推力球轴承 C.圆柱滚子轴承 D.圆锥滚子轴承
A.40 B.204 C.20 D.24
A.10mm B.50mm C.100mm D.310mm
A.8mm B.40mm C.80mm D.308mm
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