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There is a pin hole between outside shell and output axis.
外套与输出轴的径向有一个插销孔。
youdao
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The long axis diameter processing, need to resist center hole;
加工长轴外径时，需顶住中心孔；
youdao
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The long axis diameter processing, need to resist center hole;
加工长轴外径时，需顶住中心孔；
youdao