右端直径为60的轴向长度是11，圆柱上有均分布的四个( )。<img src=https://huaweicloudobs.ahjxjy.cn/BE5DA479D375AD31C50ED756B3C0F02C.png title=图片12.png alt=图片12.png style=width: 385px; height: 280px; width=385 height=280/>

【单选题】【消耗次数：1】

① 普通细牙

② 阶梯孔

③ 轴套

④ 轮盘

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