英语词典
The thin supporting member can be axially moved in the unthreaded hole, and after being adjusted to an appropriate height, the thin supporting member is fixed by the bolt.
细支撑构件可以在光孔中轴向移动，调节至适当的高度后，通过螺钉紧固住。
互联网摘选
drawing tools for unthreaded hole parts
光孔零件拔具
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