The article designs a special dial thickness gauges that measures the distance between ring-steps in two concentric bores.
设计一套特殊测厚规测量两个环形凸台的距离，这两个环形凸台位于两个同心孔内。
The article designs a special dial thickness gauges that measures the distance between ring-steps in two concentric bores.
设计一套特殊测厚规测量两个环形凸台的距离，这两个环形凸台位于两个同心孔内。
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