The connecting pole can be a screw connecting with the drill body and can also be a back extending section of the drill body.
所述连接柱可以是螺纹连接于钻体也可是钻体向后延伸的一段。
The connecting pole can be a screw connecting with the drill body and can also be a back extending section of the drill body.
所述连接柱可以是螺纹连接于钻体也可是钻体向后延伸的一段。
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