- drillpipe surface imperfection
- 钻杆: bull rod; bar; rod; drill st ...
- 表面: surface; superficies; bounda ...
- 缺陷: defect; flaw
- 表面缺陷: crizzling; surface blemishes; surface defeat; surface defect; surface flaw; surface imperfection
- 近表面缺陷: near surface defect; near surface flaw; near surface flow; nearsurfacedefect
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