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内外加厚
dril. external internal upset; internal-external upset
oil external and internal thickening
钻杆内外加厚
tech. external and internal thickening
内外加厚钻杆
dril. external-internal upset
〔钻探管材〕内外加厚
earth.sc. internal external upset
内外加厚: 9 phrases in 5 subjects
Drilling2
Earth sciences1
Mechanics1
Oil / petroleum4
Technology1

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