4818| 13
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點評
圓珠筆里面的機構很復雜,是帶齒的圓筒,而且還要考慮斜度自鎖,沒按一下,轉過一個齒
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Archiver|手機版|小黑屋|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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