当插座处于插孔向上的插 放成组钻削工具的位置时，锁杆的松开部与成组钻削工具柄部的锁紧槽相对应；
When the socket is at the position of inserting the collective drilling tool with jack upward, the locked loosing part is corresponding with the locking groove of the shank of the drilling tool.
当插座处于插孔向上的插 放成组钻削工具的位置时，锁杆的松开部与成组钻削工具柄部的锁紧槽相对应；
When the socket is at the position of inserting the collective drilling tool with jack upward, the locked loosing part is corresponding with the locking groove of the shank of the drilling tool.
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