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| Russian | English |
| основной насос | duty pump (as opposed to standby pump=резервный насос INkJet) |
| основной проект | general design (Leonid Dzhepko) |
| основной ствол | motherbore (напр., These well designs were selected mainly for their ability to maximise reservoir contact from a cased motherbore.; скважины Aiduza) |