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發(fā)布時(shí)間: 2022-8-2 09:24
正文摘要:! y: @) ^2 T0 z- ~- x 帶有預(yù)鑄孔的螺紋底孔只有三刃鉆效率最高,可以一刀解決,材料:45#鋼,HRC35°。. D% \( d; j; w+ d( r5 Z/ i |
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