2899| 11
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鉆方孔和六角孔 |
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點(diǎn)評(píng)
基本都是沖壓的
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點(diǎn)評(píng)
上海 有一個(gè) 推鉆的廠
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點(diǎn)評(píng)
通孔可以線切盲孔可以電火花,沖孔,就是不能鉆削
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