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我们可以利用废旧的千分尺改制成测量空心圆柱零件管壁尺寸的专用球头千分尺。改制后的千分尺结构如图示。将原千分尺的固定式测砧
We can use discarded micrometers into a special ball-point micrometer that measures the wall size of hollow cylindrical parts. After the restructuring of the micrometer structure as shown. The original micrometer fixed test anvil