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扶正器 fúzhèng qì
dril. centralizer; centralizers; centering guide; stabiliser
oil stabilizer
作物扶正器 fúzhèng qì
agric. lifter
套管扶正器 fúzhèng qì
dril. centralizer
扶正器: 70 phrases in 6 subjects
Agriculture4
Drilling32
Geophysics6
Mechanics2
Oil / petroleum24
Technology2