螺孔和螺栓的螺紋都圓了, 鋸掉螺栓前端, 會讓新的螺紋加入戰鬥, 增加不可靠性。

來源: 老九不能走於 2018-11-14 12:34:51 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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