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焊接缺陷 hànjiē quēxiàn
hydroel.st. welding imperfections
met. weld defect; welding defect
oil weld defects
railw. welding defects
tech. welded defect; welded flaw; notch; weld flaw
焊接 缺陷: 4 phrases in 3 subjects
Metallurgy1
Nautical1
Technology2