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发表于 2016-9-30 16:57:52
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[img]file:///C:\Users\Administrator\AppData\Roaming\Tencent\Users\940058154\QQ\WinTemp\RichOle\`9635B0NK1[~4ZH4((GIMW6.png[/img][img]file:///C:\Users\Administrator\AppData\Roaming\Tencent\Users\940058154\QQ\WinTemp\RichOle\`9635B0NK1[~4ZH4((GIMW6.png[/img]顾名思义,可以自己攻丝的螺丝。一般的螺丝必须要有加工好的螺孔才能拧进去。自攻螺丝则不需要,在拧入的同时自己进行攻丝.为达到自己攻丝的目的,这种螺丝一般都是尖头,以方便挤入待拧进的物件。[img]file:///C:\Users\Administrator\AppData\Roaming\Tencent\Users\940058154\QQ\WinTemp\RichOle\G5W(B$W`[L`O8J0EA3YC2CA.png[/img]
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