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统一标准螺纹
gen. unity thread
oil unified screw thread
space unified thread
tech. uniform thread
统一标准螺纹〈美、英、加拿大〉
plast. Unified thread
统一标准 螺纹: 16 phrases in 7 subjects
Automobiles2
Aviation1
Drilling3
Earth sciences2
Mechanics2
Oil / petroleum4
Technology2