单项选择题
A.不小于2mm B.4~6mm C.3~7mm D.4~15mm
A.4~6mm B.4~15mm C.不小于2mm D.3~7mm
A.轴承前盖 B.轴承后档 C.轴承 D.轴承外圈
A.部位 B.间隔 C.距离 D.间隙
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