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怎样在水缸的底部打个洞
更新时间: 2020-11-01 00:00:00  

在水缸的底部打个洞可以使用电钻,电钻先钻一个小孔,然后开始向四周延弧形慢慢磨,电钻是机械工业、建筑工业和装修行业常用的钻孔、打螺丝钉、起螺丝钉的工具。十九世纪奥地利人ArthurJamesArnot和WilliamBlanchBrain将电动机和钻子合装在一起,发明了最早的电钻。

关键词: 怎样 水缸 底部

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