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【简答题】
阶梯轴上与轴承配合的部分叫 ____________ ,与零件轮毂配合的部分叫 __________ ,阶梯轴中直径突变的垂直于轴线的环面部分叫 ____________ 。
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皮皮学刷刷变学霸
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A.
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