推荐回答（1个）
耳朵向外突出的是轴卡，向内突出的是孔卡。粗略测量方法：在与对称线成45°夹角状态，通过圆心（只是大致圆心，因为有两个偏心圆），从外圆轮廓起，到对面内圆轮廓的长度，就是卡圈规格。有误差，但实用。
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