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pop mark
met.	标距刻度; 刻线; 标记线; 基准点
English thesaurus
pop-mark
mech.eng.	метка // die Messmarke // Pop-marks are small holes that help the shop assemble individual parts to form an assembly. Tekla Structures can write the pop-mark information in NC files to help position parts that will be manually welded to the assembly main part. Pop-marks are usually made using a drilling machine that drills a small hole in the surface of the material. (tumanov)